. Bulletin. Natural history; Natural history. September, 1942 Prison: North American Plecoptera 329 1937 which led to additional collections of nymphs in 1938 and the rearing of the adults. The adults of signata are much larger than those of this new species and the body integument is heavily suffused with brown, whereas in this new species the body integument is very pale colored. The apical segments of the anal cerci in the adults of signata are much longer than comparable segments of this new species. Isoperla slossonae (Banks) Perla slossonae Banks (1911, p. 335). Orig- inal description, $
. Bulletin. Natural history; Natural history. September, 1942 Prison: North American Plecoptera 329 1937 which led to additional collections of nymphs in 1938 and the rearing of the adults. The adults of signata are much larger than those of this new species and the body integument is heavily suffused with brown, whereas in this new species the body integument is very pale colored. The apical segments of the anal cerci in the adults of signata are much longer than comparable segments of this new species. Isoperla slossonae (Banks) Perla slossonae Banks (1911, p. 335). Orig- inal description, $ , $ . Cliopcrla annecta Needham & Claassen (1925, p. 140). Original description, $. New synonymy. Studies of the single female type of slossonae in the collection of the Museum. d" Abdominal TERGiTEs Fig. 106.—Isoperla slossonae. of Comparative Zoology (Type No. 11,- 327), and the typic female series of an- necta, in the collection of Cornell Uni- versity, have revealed that these specimens are of the same species and hence the more recent name of annecta falls in synonymy. For the sake of exactness in record, it may be stated that the type of slossonae is some- what darker in coloration than the typic series of annecta and most specimens in the Illinois Natural History Survey col- lection, but such a difference in degree of coloring often occurs in stonefly species. The original description of slossonae mentions both the male and female, but only a single female type is now in the collection at Cambridge. The original de- scription of annecta is based upon females only, collected in New York and Quebec. Since neither Banks (1911) or Need- ham & Claassen (1925) have figured the male or described certain important char- acters useful in identifying it, I present the following brief description of certain structures. Male.—Agrees in general with de- scription of annecta as given for female by Needham & Claassen (1925). Im- portant structural differences are
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