. Bulletin. Natural history; Natural history. SSUBCENITAL PLATE gin produced backwards over ninth ster- nite, its tip somewhat truncate. Allotype, female.—Essex County, Artist's Brook, N. Y.: June 23, 1940, H. D. Dietrich. New records for this species are as follows. New York.—Cold Brook: June 30, 1940, H. Dietrich, 1$. Essex County, Artist's Brook: June 23, 1940, H. Dietrich, 3$, 10$. Mount Marcy: June 29, 1940, H. Dietrich, 16, 1$. Pennsylvania.—Swiftwater, Monroe Coun- ty: 1928, F. R. Nevin, Lot 258, 2$. AUoperla fidelis Banks AUoperla fidelis Banks (1920, p. 323). Orig- inal description, $
. Bulletin. Natural history; Natural history. SSUBCENITAL PLATE gin produced backwards over ninth ster- nite, its tip somewhat truncate. Allotype, female.—Essex County, Artist's Brook, N. Y.: June 23, 1940, H. D. Dietrich. New records for this species are as follows. New York.—Cold Brook: June 30, 1940, H. Dietrich, 1$. Essex County, Artist's Brook: June 23, 1940, H. Dietrich, 3$, 10$. Mount Marcy: June 29, 1940, H. Dietrich, 16, 1$. Pennsylvania.—Swiftwater, Monroe Coun- ty: 1928, F. R. Nevin, Lot 258, 2$. AUoperla fidelis Banks AUoperla fidelis Banks (1920, p. 323). Orig- inal description, $ . It seems desirable to record here a series of adults with brachypterous wings, both males and females, which are apparently of the species fidelis. The only differences noted between the typical fidelis and these specimens are the smaller average size, the short wings in both sexes, a slight differ- ence in shape of the indention on the pos- terior margin of the subgenital plate in the female, and the somewhat narrower supra-anal process of the male. These are the first specimens of AUoperla I have ever seen which were brachypterous, but Ricker (1939) has recorded brachypterous forms of the same species from small creeks at high elevations in British Columbia. It is of interest to note that both sexes in these specimens are short winged, whereas in many species of stoneflies this condition occurs or is reported to occur only in the inales. The specimens have the following data. Wyoming.—Dunraven Pass, Mount Wash- burn, Yellowstone National Park: Aug. 2,. (J Abdominal TERCITES (J Abdominal segments Fig. 126.—AUoperla fidelis. abdominal segments, supra-anal process of male, subgenital plate of female, and head and pronotum. AUoperla pallidula (Banks) Chloroperla pallidula Banks (1904, p. 99). Original description, $. AUoperla diibia Prison (1935^, p. 338). Original description, $, $. New synonymy. In 1935, I described diibia as a new species closely related to pallid
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
