KATHROPERLA SISKIYOU, A NEW STONEFLY SPECIES FROM CALIFORNIA AND OREGON, U.S.A. (PLECOPTERA: CHLOROPERLIDAE) 
K perdita eggs 1-6R.jpg
K perdita male 7-8R.jpg
K siskiyou eggs 9-14R.jpg
K siskiyou adult 21-25R.jpg
 
Bill P. Stark1, Boris C. Kondratieff2, and Chris J. Verdone3 
K takhoma eggsR.jpg
 
1 Box 4045, Department of Biology, Mississippi College, Clinton, Mississippi 39058, U.S.A. 
E-mail: stark@mc.edu 
 
2 Department of Bioagricultural Sciences and Pest Management, Colorado State University, 
Fort Collins, Colorado 80523, U.S.A. 
E-mail: Boris.Kondratieff@colostate.edu 
 
3 Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, Colorado 80523, U.S.A. 
E-mail: verdonec@gmail.com 
 
 
 

 
ABSTRACT 
A new stonefly species, Kathroperla siskiyou, is proposed from specimens collected in southern Oregon and northern California. Adults and eggs of the new species are compared with those of two sympatric congeners, K. perdita Banks 1920 and K. takhoma Stark & Surdick 1987. 
 
Keywords: Kathroperla, Plecoptera, Chloroperlidae, egg morphology, new species 
 
 
 

 
 
INTRODUCTION 
Egg morphology has proven to be a source of useful characters for recognition of species in many stonefly genera (Sivec & Stark 2002, 2008; Stark & Baumann 1978; Stark & Sivec 2008; Stark & Szczytko 1976; Szczytko & Stewart 1979). The tuberculate, sometimes striate, and even four sided chorion of Kathroperla Banks, 1920 eggs are perhaps the most distinctive among Chloroperlidae, and these characters have led directly to recognition of two recently named species in the genus (Stark & Surdick 1987; Stark 2010). Stark & Surdick (1987) provided scanning electron micrographs showing that eggs of K. perdita Banks, 1920 have a distinctive collar and irregular striae composed of thick, linear tuberculae, with a few small tuberculae on the interstrial surface, whereas the eggs of K. takhoma Stark & Surdick, 1987 have no collar and the entire surface is covered with small, spherical tuberculae, poorly organized into striae. Recently, the authors collected a series of Kathroperla females from the north slope of the Siskiyou Mountains of southern Oregon. Because eggs from this population appear different from those of the two recognized species, we were led to examine eggs of other available populations of Nearctic Kathroperla, and to propose a new species based on the southern Oregon and some northern California populations. 
MATERIALS AND METHODS 
Egg samples were dissected from specimens archived in 75-80% ethanol, but one egg mass was field collected and preserved directly in 80% ethanol. Eggs were placed in an ultrasonic cleaner for 12-15 seconds for cleaning, and then transferred to acetone. Specimens in acetone were individually selected using fine-tipped forceps, attached to aluminum stubs using double stick copper tape, sputter coated with gold-palladium and examined with an Amray 1810D scanning electron microscope at Mississippi College. Terminal segments of some adult male specimens were removed and placed in an ultrasonic cleaner for 15-20 seconds. Cleaned specimens were transferred through 90%, 95% and 100% solutions of ethanol for 10 minutes each, then placed in hexamethyldisilizane for 30 minutes before attaching them to aluminum stubs covered with double stick copper tape and sputter coating each of them before examination with scanning electron microscopy. After eggs were removed from female specimens, terminalia were dissected, placed in 10% KOH and brought to a boil for a few seconds. Specimens were placed in distilled water, extraneous tissue removed, and selected structures were drawn using Wild M5A and Olympus SZH10 dissecting microscopes equipped with drawing tubes. The abdomen of one male specimen of the new species was squeezed in the field to evert the internal genitalic structures prior to preservation and dissection. Specimens from the following collections were examined as indicated in the text. 
 
C.P. Gillette Museum of Arthropod Diversity, Colorado State University, Fort Collins, CO (CSUC) 
Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT (BYUC) 
Richard Bottorff Collection, South Lake Tahoe, CA (RLBC) 
John B. Sandberg Collection, Paradise, CA (JBSC) 
Bill P. Stark Collection, Mississippi College, Clinton, MS (BPSC) 
United States National Museum of Natural History, Washington, DC (USNM) 
RESULTS AND DISCUSSION 
 
Kathroperla perdita Banks 
Longhead Sallfly 
(Figs. 1-8) 
 
Kathroperla perdita Banks 1920:315. Holotype + (Museum of Comparative Zoology), Kaslo, British Columbia 
Kathroperla perdita: Needham & Claassen, 1925:132. Description of > 
Kathroperla perdita: Stark & Surdick, 1987:530. SEM image of egg 
 
Material examined. CANADA: ALBERTA: Lusk Creek, Kananaskis Forest Experiment Station, Seebe, 18 June 1968, H.J. Teskey, 1>, 1+ (BYUC). BRITISH COLUMBIA: Chilliwack River, Vedder Crossing, 24 April 1938, S. Spencer, 1+ (BYUC). Preacher Creek, Crawford Creek Rd, 31 May 2010, B. Stark, R.W. Baumann, 1> (BPSC). Princeton, Whip-saw Creek, 26 May 1968, C.H. Lindroth, 1> (USNM). Summit Creek, Hwy 3, Blazed Creek Rest Area, 2 June 2010, R.W. Baumann, B.P. Stark, 1+ (BYUC). USA: ALASKA: Juneau, tributary of McGinnis Creek, 8 June 1979, R.N. Vineyard, 1+ (BYUC). Juneau, Granite Creek, 58.3184°N, 134.3236°W, 25 June 2011, J.P. Hudson, 2+ (BYUC). Taiya River north of Skagway, 1 July 2011, J.P. Hudson, 1> (BYUC). Prince of Wales Island, Tracadora Creek, 17 June 1996, unknown collector, 1+ (BYUC). CALIFORNIA: Butte Co., Butte Creek, 1 mi above Cherry Hill Campground, 9 May 1987, Stanger, Maxfield, 1>, 4+ (BYUC). El Dorado Co., Long Canyon Creek, 3 mi E Grizzly Flats, 16 May 1998, B. Stark, C.R. Nelson, S.W. Szczytko, R. Bottorff, I. Sivec, 1+ (BPSC). El Dorado Co., North Cosumnes River, Sciaroni Crossing, Grizzly Flats, 21 April 1984, R. Bottorff, 3>, 2+ (RLBC). Humboldt Co., creek, 0.3 mi W Ruby Creek, Hwy 299, 25 April 1987, R.W. Baumann, B. Stark, C.R. Nelson, S. Wells, 1+ (BYUC). IDAHO: Bonner Co., Granite Creek, Pend Oreille Lake, 15 May 1958, S.G. Jewett, Jr. 1+ (BYUC). MONTANA: Broadwater Co., Deep Creek, Hwy 12, 15 May 1969, M.L. Miner, 1> (BYUC). Cascade Co., Belt Creek, 19 mi SE Monarch, 7 July 1966, J.R. Grierson, 1+ (USNM). Fergus Co., Windsor Creek, 
 
 
 
 
 
Figs. 1-6. Kathroperla perdita eggs. 1-4. Ross Creek, Lincoln Co., Montana. 5-6. Grande Ronde River, Union Co., Oregon. 1. Egg, lateral. 2. Chorionic detail (lt = linear tubercle; m = micropyle). 3. Collar end of egg (a = anchor). 4. Anterior pole (lid) of egg. 5. Collar end of egg (s = stria). 6. Anterior pole of egg. 
Windsor Rock Campground, 3 July 1952, R. Hays, 3> (BYUC).  Flathead Co., McDonald Creek, Glacier National Park, 15 July 1967, A.R. Gaufin, 1+ (BYUC). Gallatin Co., Hyalite Creek, 1 June 1951, R. Hays, J. Bailey, 1>, 1+ (BYUC). Glacier Co., Swift Current Creek, Glacier National Park, 24 July 1967, A.R. Gaufin, 1> (BYUC). Glacier Co., Waterton River, Glacier National Park, 23 July 1970, C. Yarmoloy, 1+ (BYUC). Lake Co., Yellow Bay Creek, 25 April 1970, R. Haick, 1+ (BYUC), 1>, 3+ (USNM). Lewis and Clark Co., tributary Blackfoot River near Roger’s Pass, Hwy 20, 17 May 1969, A.R. Gaufin, 1+ (BYUC). Lincoln Co., Ross Creek, FR 398, Cedars Scenic Area, 27 April 2008, R. Durfee, 3>, 3+ (CSUC). Mineral Co., Little Joe Creek, Little Joe Campground, 25 May 2010, B. Stark, R.W. Baumann, 2+ (BPSC). Missoula Co., Butler Creek, Snow Bowl, 12 May 1973, R.A. Haick, 9>, 4+ (USNM). Missoula Co., Grant Creek, Snow Bowl Rd, 9 May 1969, D.S. Potter, 1+ (BYUC). Missoula Co., Rattlesnake Creek, Missoula Reservoir, 16 May 1969, R.W. Baumann, 1> (BYUC). Powell Co., Arrastra Creek, Hwy 200, 10 May 1969, M.L. Miner, 5+ (BYUC). Ravalli Co., Roaring Lion Creek, 18 May 1998, A.L. Sheldon, 5> (BYUC). Ravalli Co., South Gash Creek, Rd 737, 30 May 1996, A.L. Sheldon, 1+ (BYUC). OREGON: Deschutes Co., Tumalo Creek, below Tumalo Falls, 11 June 2004, R.W. Baumann, B.P. Stark, 2> (BYUC). Douglas Co., Muir Creek, Hwy 230, 19 May 1982, B. Stark, D. Zeigler, 1>, 1+ (BPSC). Hood River Co., Cold Spring Creek, nr. Elk Meadows, 23 July 1983, G.R. Fiala, 1+ (BYUC). Linn Co., Puzzle Creek, Marion Forks Rd, 2 June 2000, B. Stark, I. Sivec, M.C. Zúniga, 1> (BPSC). Umatilla Co., 11 mi E Milton-Freewater, 16 April 1952, S.G. Jewett, Jr., 2+ (BYUC). Union Co., Five Points Creek, 28 April 1961, S.G. Jewett, Jr., 13> (USNM). Union Co., Five Points Creek, Grande Ronde River below Hilgard Junction, 18 June 1977, R.W. Baumann, 1+ (BYUC). Union Co., Grande Ronde River, Bird Track Springs Campground, Hwy 244, 45° 18.027’N, 118° 18.427’W, 15 May 2014, B. Stark, A.B. Harrison, 1+ (BPSC). WASHINGTON: Chelan Co., Bridge Creek, Hwy 20, Rainy Pass, 17 June 2004, B. Stark, R.W. Baumann, 1+ (BPSC). King Co., Green River, about 10 mi abv Lester, 27 May 1969, R.W. Baumann, M.L. Miner, 1+ (BYUC). Lewis Co., Horse Creek, FR 52, Gifford Pinchot National Forest, 15 May 2001, B.C. Kondratieff, 1>, 1+ (CSUC). Lewis Co., Stevens Creek, Hwy 706 E of Louise Lake, 15 June 1969, R.W. Baumann, 1+ (BYUC). Lewis Co., Sunbeam Creek, Hwy 706, 47° 19’N, 122° 06’W, Mt. Rainier National Park, 21 June 2003, B.C. Kondratieff, R.E. Zuellig, J. Schmidt, 1> (CSUC). Okanogan Co., Foggy Dew Creek, 8 mi SW Carlton, 18 July 1995, G. MacKenzie, 1+ (BYUC). Pierce Co., Fryingpan Creek, Mt. Rainier National Park, 24 May 2003, B.C. Kondratieff, J. Schmidt, 1> (CSUC). Pierce Co., White River, Sunrise Rd, Mt. Rainier National Park, 15 June 2001, R. Lechleitner, 1+ (CSUC). Pierce Co., White River, Hwy 410, 14 May 2001, B.C. Kondratieff, R. Lechleitner, 1+ (CSUC). Pierce Co., unnamed stream N of Crystal Creek, Hwy 410, Mt. Rainier National Park, 29 May 1997, B.C. Kondratieff, R. Lechleitner, 2+ (CSUC). Yakima Co., American River, Pleasant Valley Campground, 10 June 2001, D. Strenge, 2+ (CSUC). 
Egg. Outline oval. Length ca. 390-410 µm, equatorial width ca. 263-267 µm (Fig. 1). Collar short, wide with sides elaborately dissected; base surrounded by a low, irregularly-multitoothed rim. Anchor mushroom shaped and abundantly covered with globular bodies (Figs. 1, 3). Surface covered with widely-spaced, irregular striae along longitudinal axis; striae composed of linear tubercles ca. 20-25 µm long and ca. 5-10 µm thick (Figs. 2-6). Surface between striae relatively smooth, but bearing a few, scattered globular bodies. Micropyles subequatorial in position, located on modified strial elements (Fig. 2); orifices smaller than width of strial tubercles. 
Comments. The images (Fig. 13 in Stark & Surdick 1987; Fig. 1.9 in Stark et al. 1998a) prepared from eggs taken from a Muir Creek, Oregon female collected in May 1982 are consistent with the images presented herein from Montana and Oregon, and also consistent with eggs from California and Washington specimens examined from the sites listed above. One female from Humboldt Co., California had eggs typical of this species, although eggs from other specimens collected in that area were typical of K. takhoma. No 
 
 
 
 
Figs. 7-8. Kathroperla perdita male terminalia, Roaring Lion Creek, Ravalli Co., Montana. 7. Tergum 10 and epiproct, dorsal. 8. Detail of epiproct, dorsal (as = anterodorsal sclerite; es = epiproct stem). 
 
 
eggs were present in specimens examined from Alaska, but one Canadian female from Summit Creek, British Columbia contained eggs which were typical of K. perdita. Scanning electron micrographs (Figs. 7-8) are provided to show the relatively straight anterodorsal margin of the K. perdita male epiproct. In this species and K. siskiyou, described below, the smooth, sclerotized anterodorsal margin is completely black, whereas this structure is usually bicolored with a brown band appearing adjacent to the marginal black pigmented area in K. takhoma. The anterodorsal margin of the epiproct of K. perdita is also straighter than either of the other species. 
Distribution. The species is reported from Canada: Alberta and British Columbia, and the United States: Alaska, California, Idaho, Montana, Nevada, Oregon and Washington (Baumann et al. 1977; Kondratieff & Lechleitner 2002; Stark & Surdick 1987; Stewart & Oswood 2006; Stewart & Ricker 1997; Stewart & Stark 2002). 
 
Kathroperla siskiyou Stark & Kondratieff sp. n. 
Wagner Gap Sallfly 
(Figs. 9-19) 
 
Material examined. Holotype +, USA: OREGON, Jackson Co., Split Rock Creek, Wagner Gap Rd, 12 mi S Talent, 42.09480°N, 122.77397°W, 22 May 2014, B.C. Kondratieff, C.J. Verdone, J. Sandberg, B. Stark (USNM). Paratypes, CALIFORNIA: Sierra Co., North Yuba River, Hwy 49, near Sierra City, 10 May 1983, R.W. Baumann, R.C. Mower, 1+ (BYUC). OREGON: Same data as holotype, 2+ (CSUC). Jackson Co., East Fork Ashland Creek, south of Ashland, 19 May 2000, R.W. Wisseman, 1+ (BYUC). Jackson Co., McDonald Creek, Wagner Gap Rd, 22 May 2014, B.C. Kondratieff, C.J. Verdone, 1> (CSUC). 
Adult habitus. General color brown patterned with dark brown. Lateral margins of head bearing dark brown stripes extending from posterior margin to eye (Fig. 15); occiput pale brown in fully pigmented specimens, but infuscated in some specimens with slightly darker brown pigment. Dark ocellar spot extends forward on frons to level of antennae; antennae dark brown. Pronotum with pale brown median stripe, broad sublateral dark stripes, and an almost complete marginal ring of dark pigment interrupted on lateral margins near midlength (Fig. 15); sublateral stripes sometimes almost broken, or notched on lateral margins. Wings transparent, veins dark brown except pale brown C and Sc. Femora brown except apical black 
 
 
 
 
 
Figs. 9-14. Kathroperla siskiyou eggs, Split Rock Creek, Jackson Co., Oregon. 9. Entire egg, lateral aspect. 10. Entire egg with intact anchor. 11. Collar end chorionic detail. 12. Collar, apical aspect. 13. Anterior pole. 14. Chorionic detail (micropyle at arrow). 
 
 
19 

18 

16 

17 

15 

 
 
Figs. 15-19. Kathroperla siskiyou adult features. 15. Head and pronotum. 16. Male terminalia, dorsal. 17. Male sternum 9 with vesicle. 18. Male aedeagus, lateral (da = dorsoapical lobe; ls = lateral sclerite). 19. Female terminalia, ventral. 
 
 
ring; tibiae brown but slightly darker distally, proximally at knee and along inner margin. Abdomen pale brown on dorsum and bearing a darker median stripe and a pair of dark lateral stripes on terga 1-8; basal cercal segment pale brown but bearing minute dark spots around setal bases, subsequent segments black. Thoracic sterna dark brown; abdominal sterna brown with darker markings forming a broken, median longitudinal stripe from sterna 3-7. 
Male. Forewing length 16 mm. Epiproct typical of genus but dorsolateral extensions diverge posterolaterally from central axis (Fig. 16); anterodorsal margin of epiproct uniformly black. Basal cercal segments ca. 2-2.5 X long as wide. Vesicle body almost circular but with moderately wide base forming a short, stalk-like structure (Fig. 17). Aedeagus broad and membranous except for a pair of curved, dark brown lateral bands and a ventromedian pale sclerite (Fig. 18); surface of lateral bands bear fine, short, densely packed setae; distal margins foot-shaped. Aedeagal apex consists of three membranous lobes, median lobe finely divided by a suture-like line along most of its length. 
Female. Forewing length 17-18 mm. Lateral margins of subgenital plate slightly concave beyond midlength, apex notched; apex extends over base of sternum 9 (Fig. 19). 
Egg. Outline oval. Length ca. 380-400 µm, equatorial width ca. 230-240 µm (Figs. 9-10). Collar short, ca. 22-30 µm, wide ca. 70-80 µm (Fig. 11), elaborately dissected, and surrounded by three irregular rows of meshes and a conspicuous outer ridge forming a ring ca. 104 µm in diameter (Figs. 11-12). Anchor well developed, cushion shaped and covered with small globular bodies (Fig. 10). Chorion bearing multiple rows of longitudinal striae composed of closely grouped, irregularly shaped tubercles ca. 2-3 µm wide; interstrial areas bear scattered tubercles similar to those which comprise striae (Figs. 11, 13). Micropyles subequatorial in position and often associated with striae (Fig. 14); orifices slightly larger in diameter than bead-like components of striae. 
Larva. Unknown. 
Etymology. The species name, used as a noun in apposition, is based on the type locality in the Siskiyou Mountains of southern Oregon. The proposed common name, Wagner Gap Sallfly, is based on the access road into the sites where most of the known specimens were collected. Common names for K. perdita (Longhead Sallfly) and K. takhoma (Slenderhead Sallfly) were previously proposed by Stark et al. (1998b; 2012). 
Diagnosis. Although some overlap in subgenital plate shape occurs, females of K. siskiyou are usually distinguished from K. takhoma by a shorter subgenital plate, and by the egg structure which bears a collar and longitudinal striations formed from bead-like tubercles (Figs. 11, 13). The new species and K. perdita completely overlap in subgenital plate structure and in head pattern, but the eggs differ in the form of the chorionic tubercles. In K. perdita these structures are thick and long (Figs. 5-6), whereas in the new species they are formed as longitudinal clusters of bead-like structures (Figs. 11, 13). The only known male specimen of this species appears intermediate between K. perdita and K. takhoma. The basal cercal segments and, general head coloration and pigment pattern of the dorsal margin of the epiproct are similar to those of K. perdita, whereas the vesicle shape and dorsal epiproct margin are more similar to K. takhoma. Males of the three Nearctic species have similar aedeagal structure but when a larger sample is available the shape and size of the lateral sclerites may offer another useful character. We offer a preliminary key below to assist in distinguishing these three species. 
 
Kathroperla takhoma Stark & Surdick 
Slenderhead Sallfly 
(Figs. 20-25) 
 
Kathroperla takhoma Stark & Surdick 1987:527. Holotype + (United States National Museum), Falls Creek above Ohanapecosh River, Mt. Rainier National Park, Hwy 706, Washington 
 
Material examined. USA: CALIFORNIA: Del Norte Co., 3 mi NE Hiouchi, 1 June 1991, B. Stark, R.W. Baumann, C. Henderson, 1+, 1 larva (BPSC). Humboldt Co., Cedar Creek, Hwy 299, 25 April 1987, B. Stark, R.W. Baumann, C.R. Nelson, 2>, 5+ (BPSC). Humboldt Co., 1 mi E Cedar Creek, Hwy 299, 25 April 1987, B. Stark, R.W. Baumann, C.R. Nelson, 1> (BPSC). Humboldt Co., East Fork Willow Creek, East Fork Willow Creek Campground, 24 April 1987, B. Stark, R.W. Baumann, C.R. Nelson, 1>, 4+ (BPSC). Humboldt Co., Slide Creek, Hwy 13 south of Fish Lake Campground, 31 May 1991, B. Stark, R.W. Baumann, C. Henderson, 1+ (BPSC), 2+ (BYUC). Mendocino Co., Irish Gulch, 39° 01.209’N, 123° 
 
 
 
 
 
Figs. 20-25. Kathroperla takhoma eggs, Bridal Veil Creek, Multnomah Co., Oregon. 20. Entire egg, lateral aspect. 21. Collar end chorionic detail. 22. Anterior pole. 23. Collar, apical aspect. 24. Chorionic detail adjacent to collar. 25. Chorionic detail (micropyle at arrow). 
41.268’W, 22 April 2005, L.D. Bottorff, 1+ (RLBC). Mendocino Co., Same location, 2 April 2005, L.D. Bottorff, 1> (RLBC). Trinity Co., Clear Creek and tributaries, Hwy 36, 2.6 mi E of Forest Glen Campground, 40.3743°N, 123.3634°W, 9 May 2009, J.B. Sandberg, 2>, 2+, 1 larva, 2 exuvium (JBSC). OREGON: Benton Co., Yew Creek, Mary’s Peak Rd, 1 June 2000, B. Stark, I. Sivec, M. Zúniga, 1+ (BPSC). Benton Co., Lewisburg Saddle, Malaise trap, 44.6423°N, 121.4204°W, 31 May-12 June 2013, S. Fitzgerald, 5>, 8+ (CSUC). Same location, Malaise trap, 6-31 May 2013, S. Fitzgerald, 2+ (CSUC). Lane Co., Watershed #10, Anderson Experimental Forest, 20 April 1972, R.W. Wisseman, 1>, 1+ (BYUC). Linn Co., tributary North Santiam River, Hwy 22, 0.2 mi below Minto Rd, 3 June 2000, B. Stark, I. Sivec, M. Zúniga, 1+ (BPSC). Multnomah Co., Bridal Veil Creek below Bridal Veil Falls, 13 May 2003, B.C. Kondratieff, R.W. Baumann, 1+ (CSUC). Multnomah Co., Columbia River junction with Tanner Creek, 28 March 1987, G.R. Fiala, 1> (BYUC). WASHINGTON: Clallam Co., Madison Creek, Madison Creek Falls, Elwah River Valley, Olympic National Park, 48° 02’N, 123° 35’W, 15 June 2005, R.W. Baumann, B.C. Kondratieff, 1+ (BYUC). Jefferson Co., Mineral Creek, tributary Hoh River, N 102-103, E 33-34, 24 June 1999, D.E. Bowles, 1+ (BYUC). Lewis Co., Faith Creek, Hwy 706, Mt. Rainier National Park, 17 June 2004, B.C. Kondratieff, J. Schmidt, 2+ (CSUC). Lewis Co., St. John Creek, Rt. 22, 13 mi E Rt. 23, 1 July 1985, C.M. Flint, O.S. Flint, Jr., 2> (USNM). Lewis Co., tributary Ohanapecosh River, Mt. Rainier National Park, 7 July 1999, B.C. Kondratieff, 1+ (CSUC). Mason Co., Brown Creek, FR 2233, 12 mi NW Shelton, 22 April 1995, T.Nash, 1> (BYUC). Skamania Co., Rock Creek, Millard, tributary Little Salmon River, 15 May 2003, B.C. Kondratieff, R.W. Baumann, 1> (CSUC). Skamania Co., tributary Little White Salmon River, near Oklahoma Campground, 27 May 1984, G.R. Fiala, 1+ (BYUC). Whatcom Co., Breckenridge Creek, 5 mi E Eversen, 11 May 1967, unknown collector, 1+ (BYUC). Whatcom Co., Canyon Creek, Deming, 21 April 1967, unknown collector, 1> (BYUC).Whatcom Co., Sygitowicz Creek, 2 mi SW Van Zandt, 5 May 1994, Kraft and Sammeth, 1> (BYUC). 
Egg. Outline oval, collar absent (Figs. 20-21, 23). Length ca. 431 µm, equatorial width ca. 253 µm. Collar end of egg bearing a dense cluster of small tubercles (Fig. 23). Chorionic surface sparsely covered throughout with small, projecting tubercles of irregular height (Figs. 23-25); some tubercles are grouped in poorly organized, short rows but most appear randomly placed. Micropyles subequatorial in position and frequently located in association with tubercles (Fig. 25). 
Distribution. This species has previously been reported from California and Washington (Bottorff & Bottorff 2007; Kondratieff & Lechleitner 2002; Nelson & Stark 1987; Stark & Surdick 1987). The Oregon records listed above, though not unexpected, are the first reports from that state. 
 
Preliminary Key to Nearctic Kathroperla Species 
 
1 Lateral pronotal margin of adults usually entirely yellow; female subgenital plate usually reaching posterior margin of sternum 9 (Fig. 4 in Stark & Surdick 1987); egg collar absent and chorionic striations absent (Figs. 20-25); dorsal margin of epiproct usually bicolored with a black anterior band adjacent to a dark brown band (Fig. 1 in Stark & Surdick 1987); basal male cercal segments about 3 times long as wide ………………………………………….. K. takhoma 


1’ Lateral pronotal margins of adults with black pigment extending at least a third of the margin length, but often completely dark (Fig. 15); egg collar present, chorionic striations present although sometimes indistinct (Figs. 1-6, 9-14); dorsal margin of epiproct narrow and black; basal male cercal segments about 2-2.5 times long as wide ………………………………...…… 2 
2 Dorsolateral margin of male epiproct slanted conspicuously caudad (Fig. 16); egg chorion covered with fine bead-like tubercles poorly organized into striations (Figs. 9-14) ………………………….………………. K. siskiyou 


2’ Dorsal margin of male epiproct almost straight; egg chorion covered with thick tubercles 
organized into well-developed longitudinal striations (Figs. 1-6) …………....….…... K. perdita 
 
ACKNOWLEDGEMENTS 
We thank R.W. Baumann of the Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT, R.L. Bottorff, South Lake Tahoe, CA and O.S. Flint, Jr., United States National Museum of Natural History, Washington, DC for the loan of specimens, and J.B. Sandberg, California Department of Fish and Wildlife-A.B.L., and CSUC Research Foundation, California State University, Chico, CA generously provided records of K. takhoma from his collection. We also thank A.B. Harrison, Department of Biology, University of Mississippi, Oxford, MS and J.B. Sandberg for assistance in field work. 
 
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Szczytko, S.W. & K.W. Stewart. 1979. The genus Isoperla (Plecoptera) of western North America; 
Holomorphology and systematics and a new stonefly genus Cascadoperla. Memoirs of the American Entomological Society, 32:1-120. 
 
 
Received 24 February 2015, Accepted 11 March 2015, Published 27 March 2015