. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 267 wings suffused with varying shades of Plains. Records are available for Arkansas, brown. ^Vlale genitalia, fig. 961, p. 288, with California, Colorado, Florida, Georgia, Illi- hand-shaped claspers, narrow and beaklike nois, Indiana, Kentucky, Michigan, Minne- tenth tergite and cylindrical, curved aedea- sota, Missouri, Montana, New Brunswick, gus. An added diagnostic character is the New Hampshire, New York, Nova Scotia!. ,,,,,,'--:- -';;,in ./ ;'- â â ""'»i||â',iii
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 267 wings suffused with varying shades of Plains. Records are available for Arkansas, brown. ^Vlale genitalia, fig. 961, p. 288, with California, Colorado, Florida, Georgia, Illi- hand-shaped claspers, narrow and beaklike nois, Indiana, Kentucky, Michigan, Minne- tenth tergite and cylindrical, curved aedea- sota, Missouri, Montana, New Brunswick, gus. An added diagnostic character is the New Hampshire, New York, Nova Scotia!. ,,,,,,'--:- -';;,in ./ ;'- â â ""'»i||â',iii; Fig. 905.âHelicopsyche borealis, larva. slightly clavate, sclerotized spur of the sixth sternite. Female abdomen with very distinc- tive pattern of sclerites, those of the basal segments reticulate, as in fig. 907; bursa copulatrix small and stalked. The male abdomen has similar reticulation. This species is widely distributed in Illi- nois but is confined to relatively clear and swift streams, such as the Kankakee and Salt Fork Rivers and Split Rock Brook, and is found also in the glacial lakes of the northeastern corner of the state. The lar- vae are found chiefly under stones. There is apparently a continuous succession of generations, our adult emergence ranging from May 28 to September 7. This insect is one of the best known caddis flies and has received much attention. Vor- hies (1909) has reared and described all stages very completely. Betten (1934) also has illustrated char- acters of this species in considerable detail. The curious snail-like case has attracted the attention of many entomologists and col- lectors of natural history objects. It is re- markably constant in structure, varying little in shape over the species range. The continental range of the species is very wide, stretching from Mexico north- eastward to Nova Scotia and westward to Montana and Oregon; the range embraces most of the forested areas of the continent, forming a complete circle arou
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