Sierracapnia, A New Genus Of Capniidae (Plecoptera) From Western North America Author Bottorff, Richard L. 1963 Toppewetah Street, South Lake Tahoe, California 96150, U. S. A. E-mail: richbot @ yahoo. com richbot@yahoo.com Author Baumann, Richard W. Department of Biology and Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah 84602, U. S. A. E-mail: richard _ baumann @ byu. edu richard_baumann@byu.edu text Illiesia 2015 11 9 104 125 journal article http://doi.org/10.5281/zenodo.4757677 c19d6b36-e361-4626-b48c-da9c7ff654ff 1854-0392 4757677 E0490810-CC36-4D85-9BEF-DBC91BD9F59F Sierracapnia yosemite ( Nelson and Baumann 1987 ) ( Figs. 34-37 ) Sierracapnia yosemite ( Nelson and Baumann 1987): 491 . Holotype ♂ ( USNM ). Type locality: California , Mariposa Co. , Big Creek , Summerdale Campground . Material Examined. USA , California : Mariposa Co., Big Creek, Hwy 41, Summerdale Campground above Fish Camp, 18-III-1985 , R.W. Baumann & C.R. Nelson, 28♂ , 11♀ ( USNM , BYUC ) ; Chilnualna Creek, above Wawona, 18-III-1985 , R.W. Baumann & C.R. Nelson, 1♂ , 2♀ ( BYUC ) ; creek at south entrance Yosemite National Park, 18-III-1985 , R.W. Baumann & C.R. Nelson, 5♂ , 3♀ ( BYUC ) . Tuolumne Co., Middle Fork Tuolumne River, Evergreen Road, 18-III-1985 , R.W. Baumann & C.R. Nelson, 31♂ , 6♀ ( BYUC ) ; South Fork Tuolumne River, Evergreen Lodge Road, NW Big Oak Entrance, 18-III-1985 , R.W. Baumann & C.R. Nelson, 38♂ , 37♀ ( BYUC ) ; South Fork Tuolumne River, Hwy 120, Smoky Jack Campground, N 37°49’ W 119°43’ , 22-VI-2006 , R.W. Baumann & B.C. Kondratieff, 1♂ ( BYUC ) . Figs. 34-37. Sierracapnia yosemite . Male: Tuolumne River, California: 34. Genitalia, lateral, epiproct, knob on tergum 7 and knobs on tergum 9. 35. Genitalia, dorsal, epiproct and knobs on tergum 9. 36. Epiproct, lateral, apex. 37. Knob on tergum 7, anterior. Male. Tergum 7 knob tall, thin, and narrowly divided at apex (knob height 30-35% of segment 7 height; knob width 14-15% of segment 7 width) ( Figs. 34, 37 ). Epiproct in dorsal view with uniform width along length, maximum width 18-24% of epiproct length; maximum width occurs anterior of mid epiproct; apex rounded or wedge-shaped, with a long thin posterior-projecting lobe ( Fig. 35 ); dorsal membrane light colored. Epiproct in lateral view with a shallow reverse (S-shaped) curve dorsally and deep curve ventrally; maximum depth 25-30% of length; maximum depth occurs in anterior third of epiproct; apex elongated and raised, with thin median lip that wraps around tip of eversible crest; neck narrow ( Figs. 34, 36 ). Dorsolateral horns arch high above main epiproct body, exposing membrane of eversible crest in lateral view; horn length 18-21% epiproct length; horn tips extend forward to 85-88% of epiproct length ( Fig. 36 ; Table 1 ). Female. Subgenital plate heavily sclerotized and dark, plate covers entire width of sternum 8 from its posterior to anterior edge, sclerotization extends onto posterior third of sternum 7 (Fig. 257, Nelson and Baumann 1989 ). Distribution. Sierracapnia yosemite inhabits the western slope of central and southern Sierra Nevada near Yosemite National Park in Mariposa and Tuolumne counties, California ( Fig. 39 ).