. Bulletin. Natural history; Natural history. August. 1944 Ross: Caddis Flies of Illinois 207 Adults.—Length 16 mm. Body and ap- pendages various shades of brown and gray, the wings with light areas in the middle forming a more or less checkered pattern. Male genitalia, fig. 706: tenth tergite some- what hood shaped, produced into a short, rounded beak at apex; claspers with a small basal portion which merges gradually into a long, apical blade; at the extreme base of. Fig. 710.—Molanna uniophila, case. the clasper there arises a short, mesal, flat process bearing short setae at its apex; aede
. Bulletin. Natural history; Natural history. August. 1944 Ross: Caddis Flies of Illinois 207 Adults.—Length 16 mm. Body and ap- pendages various shades of brown and gray, the wings with light areas in the middle forming a more or less checkered pattern. Male genitalia, fig. 706: tenth tergite some- what hood shaped, produced into a short, rounded beak at apex; claspers with a small basal portion which merges gradually into a long, apical blade; at the extreme base of. Fig. 710.—Molanna uniophila, case. the clasper there arises a short, mesal, flat process bearing short setae at its apex; aedeagus tubular and slightly curved, con- taining an eversible group of long spines. Female genitalia very simple, bursa copu- latrix small and without complicated struc- tures. In Illinois this species has been collected only in the glacial lakes and connecting streams in the northeastern part of the state. In these localities the larvae are found on gravel bars where they may occur in large local colonies. Our adult records are all for May and June, indicating a single generation per year. The curious case of this insect has been the cause of frequent remarks by students of aquatic insects. Vorhies reared this spe- cies from Wisconsin, and we have reared it from Channel Lake, Illinois. The range of the species is extensive through the Northeast. Records are avail- able for Michigan, Minnesota, New Bruns- wick, New York, Ohio, Pennsylvania, Que- bec and Wisconsin. Illinois Records.—Antioch : July 1, 1931, Frison, Betten & Ross, 1 $ ; July 6, 1932, Frison et al, 6$ ; June 11, 1936, Ross & Burks, $$,99; June 12, 1936, Ross & Burks, 2$, 19. Channel Lake: May 16, 1936, Ross & Mohr, many pupae which were reared, adults emerging June 1-3, 1936, Urbana; May 27, 1936, H. H. Ross, $ $, ? 9, many pupae, larvae and cases; May 31, 1938, Mohr & Burks, 1 larva. Fourth Lake, Lake County: Aug. 2, 1887, C. A. Hart, \$. Fox Lake: June 30, 1935, DeLong & Ross, $ $ , 9
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