. Bulletin. Natural history; Natural history. 274 'ois Natural History Survey Bulletin J'ol. 21. Art. 2 ex'oluta for an Illinois species heretofore confused \vith arida as used in the sense of Frison I'^^Srt. Tlie transfer now of the name evoluta to my arida material of 1935rt leaves the species called evoluta in 1Q37 "without a name," as Ricker (1938) has earlier suggested. Part of the material listed by Needham & Claassen (1925) as arida belongs to the species 1 am now recognizing as arida {^= valida) and part belongs to the spe- cies I am here recognizing as evoluta. Cl
. Bulletin. Natural history; Natural history. 274 'ois Natural History Survey Bulletin J'ol. 21. Art. 2 ex'oluta for an Illinois species heretofore confused \vith arida as used in the sense of Frison I'^^Srt. Tlie transfer now of the name evoluta to my arida material of 1935rt leaves the species called evoluta in 1Q37 "without a name," as Ricker (1938) has earlier suggested. Part of the material listed by Needham & Claassen (1925) as arida belongs to the species 1 am now recognizing as arida {^= valida) and part belongs to the spe- cies I am here recognizing as evoluta. Clark's (1934) record of evoluta from Put-iii-Bay, Ohio, mentioned as belonging to arida in my 1935^ paper, again becomes part of the bibliography of evoluta as here recognized. Since Carman's (1912) de- scription of "Larva No. 1" and his fig. 47 are equivalent to arida in the sense of Frison 1935^, it also must be included in the bibliography of evoluta as now ac- cepted. Acroiieuria prolonya Claassen (1937^*) was described on the basis of a single fe- male from "Bridger Mountains, Montana, June 19, ; I have studied this type in the collection of Cornell University and consider it to be the same as my arida material of 1935<'/, which I am now calling evoluta as a result of Ricker's remarks concerning the type. Any differences which might be observed between the sub- genital plates of evoluta, as now accepted, and prolouga are certainly slight and I believe well within the range of individual variation. For the convenience of other students and the bibliographic record, I have given the complete bibliography of evoluta to date. My only question is whether the name of evoluta is even now being cor- rectly used, a matter impossible to investi- gate further at this time. Acroneuria mela new species Acroneuria evoluta Needham k Claassen (1925, p. 186). At least in part. Acronniria arida Claassen (1931, p. 81, figs. 202 and 207). Nymph. Acroneuria sp. a Fri
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