Variation In The Epiproct Of Arsapnia Decepta Banks, 1897 (Plecoptera: Capniidae), With Comments On Arsapnia Coyote (Nelson & Baumann 1987) Author Baumann, Richard W. & Bill P. Stark & Department of Biology and Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah, U. S. A. 84602 E-mail: richard _ baumann @ byu. edu richard_baumann@byu.edu Author Stark, Bill P. Department of Biology, Box 4045, Mississippi College, Clinton, Mississippi, U. S. A. 39058 E-mail: stark @ mc. edu stark@mc.edu text Illiesia 2017 13 1 1 21 journal article http://doi.org/10.5281/zenodo.4761024 2db066bb-70d2-4ae3-9c6d-357970724db5 1854-0392 4761024 602D4DFC-273B-4DDC-8EB0-D60D68503B71 Arsapnia coyote (Nelson & Baumann) Coyote Snowfly ( Figs. 67-72 ) Capnia coyote Nelson & Baumann, 1987b:487 . Holotype ♂ , (United States National Museum), Little Rock Creek , Cooper Canyon Campground , San Gabriel Mountains , Los Angeles Co. , California http://lsid.speciesfile.org/urn:lsid:Plecoptera.speciesfile.org: TaxonName:4978 Arsapnia coyote : Murányi, Gamboa & Orci, 2014:14 http://lsid.speciesfile.org/urn.lsid:Plecoptera.speciesfile.org: TaxonName:465452 Material examined. USA : California : Los Angeles Co. , Little Rock Creek , Cooper Canyon Campground , San Gabriel Mountains , 31 March 1981 , R . W. Baumann , J. Stanger , 3♂ ( BYUC ). San Bernardino Co. , East Fork of West Fork before Mohave River above Silverwood Lake , 9 January 1988 , R .W. Baumann , C. R . Nelson , 1♂ ( BYUC ) . Male epiproct (n = 2). Length 575-618 μm, width at midlength 223-236 μm, Body of epiproct expanded into convex ear-like lobes near midlength ( Figs. 67, 70 ). Width across neck 67-83 μm. Shape and general structure similar to those of populations of A. decepta examined. Left side setal spines in clusters of 25-28, and 28-32 on the right. Figs. 61-66. Arsapnia decepta male reproductive structures, 61-63. Arroyo La Corona, Sierra San Pedro Martir National Park, Baja California. 64-66. Cañon de Agua, Bowman Ranch, near Colonia Juarez, Chihuahua. 61. Epiproct, anterodorsal. 62. Epiproct, setal spine clusters, anterodorsal. 63. Epiproct, lateral. 64. Epiproct, dorsal. 65. Epiproct, oblique lateral. 66. Epiproct apex and setal spine clusters, dorsal. Figs. 67-72. Arsapnia coyote male reproductive structures. 67-69. Little Rock Creek, Los Angeles Co., California.70-72. Mohave River, San Bernardino Co., California. 67. Abdominal segments 7-10, dorsal. 68. Epiproct apex and setal spine clusters. 69. Epiproct, oblique lateral. 70. Abdominal segments 7-10, dorsal. 71. Epiproct apex and setal spine clusters. 72. Epiproct apex, lateral. Tergal process (n = 2). Bearing a slight to moderate notch of posteromedian margin ( Figs. 67-70 ). Dorsolateral lobes bearing patches of small conical tubercles. Width of process across anterior margin 200-280 μm. Comments. Arsapnia coyote is presently considered an endemic to southern California and the sister species of A. decepta ( Nelson & Baumann 1987b ) . The two species overlap in many morphological features including epiproct width and setal spine counts, however two of the three longest epiprocts among specimens studied are of this species, and the epiproct length/width ratios (2.58 and 2.61 respectively, Table 6 ) for these two specimens are the highest observed. Nelson & Baumann (1987b) distinguished the two species, in part, by virtue of a flatter dorsal epiproct surface and smaller epiproct depth (compare Figs. 69 and 72 with Figs. 4 and 18 ). Recently, Heinold et al. (2014) supported recognition of A. coyote as a distinct species based on their report of an average genetic divergence of 1.9% between males of A. coyote and A. decepta .