. Bulletin. Natural history; Natural history. 272 Illinois Natlral Hisiory Slrvkv Bulletin To/. 22. Art. 2 cerning the ramificitions of this variation. However, it seems desirable to illustrate a form which is commonly encountered in the Great Smoky Mountains National Park near Gatlinburg, Tenn., because its identity mi^ht be overlooked. The nymph of this variant is shown in iig. 37. Fiy. is a dorsal view of the head and pronotum of this variant, and fig. 38/i. Adult head and pronotum Fiji. 38.—Perlesta placida: A from Great Smoky Mountains National Park, B from lower altitudes. is the sa
. Bulletin. Natural history; Natural history. 272 Illinois Natlral Hisiory Slrvkv Bulletin To/. 22. Art. 2 cerning the ramificitions of this variation. However, it seems desirable to illustrate a form which is commonly encountered in the Great Smoky Mountains National Park near Gatlinburg, Tenn., because its identity mi^ht be overlooked. The nymph of this variant is shown in iig. 37. Fiy. is a dorsal view of the head and pronotum of this variant, and fig. 38/i. Adult head and pronotum Fiji. 38.—Perlesta placida: A from Great Smoky Mountains National Park, B from lower altitudes. is the same view of more nearly typical specimens taken at lower elevations. The difterence in color pattern is quite notice- able even in old pinned specimens. The nymph of this variant, fig. 37, differs from t\pical specimens from elsewhere in its generally lighter color and in the com- parative absence of numerous short, stout setae which usually give the nymphs a freckled appearance (Frison 1935a, figs. 307 and 308). Acroneuria arida (Hagen) Perla arida Hagen (1861, p. 18). Original description, i , $. Pcrla valiJa Banks (1906rt, p. 32). Orig- inal description, $. Previously correctly syn- onymized by Needham & Claassen (1922). Acroneuria arida Needham & Claassen (1925, p. 185). In part. Acroneuria arida Claassen (1940, p. 172). Catalogue—in part. Through the courtesy of Dr. Nathan Banks, I have had the privilege of study- ing in considerable detail the types of Perla arida Hagen ( 1 female, No. 14,386) and P. valida Banks (1 female, No. 11, 315), both in the collection of the Mu- seum of Comparative Zoolog}'. Because of the importance of establishing the pres- ence or absence of anal gill remnants on the subanal lobes, the apical abdominal segments of the typic female of arida from "Philadelphia—VVinthem" were clipped from the abdomen, softened in potassium hydroxide and studied in fluid. The typic female of valida is from "Wavnesville, N. C, July, 1901
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