. Memoirs of the American Entomological Society . e group is distributed from New Mexico, Colorado, Utah andNorthern California, northward into Canada (Fig. 83). Species inhabitcreeks and small- to medium-sized rivers. Emergence occurs from earlyApr. until early Aug., and all are thought to undergo univoltine life cycles. Isoperla sobria (Hagen) Perla sobria Hagen, 1874, 7:577. Holotype 2; Colorado mountains, Colorado,USA (MCZ #247). MEM. AMER. ENT. SOC, 32 50 WESTERN ISOPERLA Perla ebria, Hagen, 1874, 7:577. Holotype 2; Colorado mountains, Colorado, USA (MCZ #248). NEW sob
. Memoirs of the American Entomological Society . e group is distributed from New Mexico, Colorado, Utah andNorthern California, northward into Canada (Fig. 83). Species inhabitcreeks and small- to medium-sized rivers. Emergence occurs from earlyApr. until early Aug., and all are thought to undergo univoltine life cycles. Isoperla sobria (Hagen) Perla sobria Hagen, 1874, 7:577. Holotype 2; Colorado mountains, Colorado,USA (MCZ #247). MEM. AMER. ENT. SOC, 32 50 WESTERN ISOPERLA Perla ebria, Hagen, 1874, 7:577. Holotype 2; Colorado mountains, Colorado, USA (MCZ #248). NEW sobria, Banks, 1902, 34 ebria, Banks, 1907a: 13. Clioperla ebria, Needham and Claassen, 1925, 2:141 (male and female genitalia).Clioperla sobria, Needham and Claassen, 1925, 2:143 (female genitalia).Clioperla ebria, Claassen, 1940, 232 sobria, Claassen, 1940, 232 ebria, Ricker, 1943, 12:121 (adult and nymph head and pronotum, nymphal maxilla and habitus, and female genitalia).Isoperla ebria, lilies, 1966 Figure 83. — Distribution of the /. sobria complex. S. W. SZCZYTKO & K. W. STEWART 51 Isoperla sobria, lilies, 1966:240. Isoperla ebria, Zwick, 1973:244. Additional references: Isoperla ebria, Banks, 1907b; Dodds and Hisaw, 1929; Neave,1929; Claassen, 1931 (description of nymph, no illustrations); Hoppe, 1938;Gaufin, 1955; Jewett, 1959 and 1960 (male and female genitalia); Knight et al.,1965b (ova); Gaufin et al., 1966 (male and female genitalia, and adult head andpronotum); Newell, 1970; Baumann, 1971; Gaufin et al., 1972 (male and femalegenitalia, and adult head and pronotum); Stewart et al., 1974; Ricker andScudder, 1975; Baumann et al., 1977 (male and female genitalia and adult headand pronotum). Isoperla sobria, Banks, 1907a. Male. — Macropterous. Length of forewings 9-11 mm; length of body 8-11mm. General body color medium to dark brown. Head-pronotal pigment patterndark. Ocelli connected by triangular dark pigment, extending
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