. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 253 males, taken May 18 to August 20, and many larvae, taken May 16 to June 12, are from Antioch, Channel Lake, Fox Lake, Grass Lake, Grayslake, Pistakee Lake, Richmond, Round Lake, Urbana, Wilming- ton, Zion. Triaenodes species a Female.—Length 9 mm. Color tawny with the brown and cream pattern typical of the tarda group. Female genitalia, fig. 857: apex of ninth sternite not greatly produced, typical in general form of the tarda group; tenth tergite without conspicu- ous apodemes; bursa copulatrix with
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 253 males, taken May 18 to August 20, and many larvae, taken May 16 to June 12, are from Antioch, Channel Lake, Fox Lake, Grass Lake, Grayslake, Pistakee Lake, Richmond, Round Lake, Urbana, Wilming- ton, Zion. Triaenodes species a Female.—Length 9 mm. Color tawny with the brown and cream pattern typical of the tarda group. Female genitalia, fig. 857: apex of ninth sternite not greatly produced, typical in general form of the tarda group; tenth tergite without conspicu- ous apodemes; bursa copulatrix with its ventral bands folded, long and shelflike and heavily sclerotized; the hook set in the apex of the bursa is very heavily sclerotized, especially the margins of the base, giving it a hollow appearance from ventral view. We have taken only one female of this species, from Herod, Illinois, May 29, 1935, Ross & Mohr. We have taken no male which could be positively associated with it, but it is definitely none of the other species of which we have record from the state. There is a possibility that it may be the female of phalacris or dipsia, both taken from southern Ohio, or it may be an entirely different species. Triaenodes species b Larva. — Fig. 838. Length 10 mm. Ground pattern of sclerites straw color; head with spots coalesced to form a pair of long, broad lines down the central por- tion and a pair of short, broad lines on the lateral margin, the ventral aspect almost all dark so that only narrow pale areas appear between the ventral and lateral dark markings; pronotum mostly brown with a pale mesal line, a pale postero-mesal area and a pair of pale lateral spots. Case typi- cal for genus. This is an unreared larva of which we have taken only one specimen, from Herod, Illinois, May 15, 1941, Mohr & Burks. It probably belongs to one of the species recorded from southern Illinois on the basis of adults, including perna and species a. Mystacides Berthold Mystacid
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