. Bulletin. Natural history; Natural history. 96 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 3 All Sable river; May 21, 19J6, Krison & Ross. Lovells, All Sable river: May 22, 1936, Prison & Ross. Hale, Au Gres river. May 21, 1936, Prison & Ross. Wisconsin.âDells, Wisconsin river: June 5, 1936, Prison & Ross. Spooner, Namakagon river: June 5-6, 1936, F'rison & Ross. Cast nymphal skins. Michigan.âHonor, Platte river: Sept. 16, 1936, Ross & Burks. Wisconsin.âSpooner, Namakagon river: June 5-6, 1936, Prison & Ross. AUoperla exquisita Frison Alloperla exquisi
. Bulletin. Natural history; Natural history. 96 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 3 All Sable river; May 21, 19J6, Krison & Ross. Lovells, All Sable river: May 22, 1936, Prison & Ross. Hale, Au Gres river. May 21, 1936, Prison & Ross. Wisconsin.âDells, Wisconsin river: June 5, 1936, Prison & Ross. Spooner, Namakagon river: June 5-6, 1936, F'rison & Ross. Cast nymphal skins. Michigan.âHonor, Platte river: Sept. 16, 1936, Ross & Burks. Wisconsin.âSpooner, Namakagon river: June 5-6, 1936, Prison & Ross. AUoperla exquisita Frison Alloperla exquisita Prison (1935b, p. 337). This species was originally described from males only and from material collect- ed in Oregon. Additional material from Washington and British Columbia has ABDOMINAL STERNITES. Fig. %'a.^Alloperla sqnisila. â made available the previously unknown female and therefore the description of this sex is now given. FEMALE.âSimilar in most morphological features to the male (Frison 1935b). Eighth abdominal sternite, fig. 85, with >ubgenital plate produced backwards over about one-half of ninth sternite and with posterior margin approximately truncate. Allotype, female.âShucksan, Wash., Bagley creek, 2700 feet elevation; July 24, 1936, H. H. Ross. British Columbia.âCultus lake, Smith Palls creek: May 20, 1935, W. E. Ricker, Icf, 19. Washington. â Shucksan, Bagley creek, 2700 feet elevation: July 24, 1936, H. H. Ross, 5cf, 119; Razorhone creek, 3200 feet elevation: July 24, 1936, H. H. Ross, Hd', 119. AUoperla occidensânew species MALE.âBody, cerci, antennae and legs in general a pale yellowish white. Dark or black areas are as follows: ocelli and com- pound eyes, fig. 86, lateral margins of pro- notum, a U-shaped mark on meso- and metanotum, a broad median longitudinal stripe extending across all abdominal ter- gites up to the ninth, and basal segments 1 through 3 with a small dark stripe on each lateral margin running parallel to median stripe. H
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