. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 171 areas. There is only a single generation per year, the adults being present in June and early July. Illinois Records. — Algonquin: June 30, 1906, 1 9 ; May 25, 1908, 1 ? ; July 9, 1909, 1 9 ; July 12, 1910, 1 9 , all by W. A. Nason. Cedar Lake: June 19, 1892, H. S. Shiga, 19. Champaign: at electric light, June 17, 1886, Hart, 1^. ZiON: many larvae, pupae and adults (including the type series) taken in or near Dead River from May 15 to July 7. Ptilostotnis Kolenati Ptilostomis Kolenati (1859^, p. 198).
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 171 areas. There is only a single generation per year, the adults being present in June and early July. Illinois Records. — Algonquin: June 30, 1906, 1 9 ; May 25, 1908, 1 ? ; July 9, 1909, 1 9 ; July 12, 1910, 1 9 , all by W. A. Nason. Cedar Lake: June 19, 1892, H. S. Shiga, 19. Champaign: at electric light, June 17, 1886, Hart, 1^. ZiON: many larvae, pupae and adults (including the type series) taken in or near Dead River from May 15 to July 7. Ptilostotnis Kolenati Ptilostomis Kolenati (1859^, p. 198). Geno- type, monobasic: Ptilostomis kovalevskii Kole- nati. All the species of this genus are brown, frequently with an angulate dark brown mark in the hind wings. The shelflike projection of the male ninth sternite and the broad ninth sternite of the female, with its two lateral finger-like processes and mesal triangular process, are diagnostic. The larvae have no mesal dark line down the frons and have the diagonal marks on the pronotum forming an arcuate mark, fig. 565. To date no characters have been found to separate the larvae to species. They make a long cylindrical case of spiral formation similar to that of other members of the family. Four species of the genus are recognized, three of which occur in Illinois. The geno- type, kovalevskii, described from Alaska, has never been identified definitely, and we do not know whether it constitutes a fifth Ne- arctic species of the genus or whether it is the same as one of the four treated below. KEY TO SPECIES Adults 1. Maxillary palpi 4-segmented (males) 2 Maxillary palpi 5-segmented (females) 5 2. Apex of tenth tergite with a pair of long, curved, filiform blades, fig. 594 semifasciata, p. 173 Apex of tenth tergite at most with long setae, fig. 595 3 3. Base of tenth tergite with two pairs of processes which arise from it, then angle suddenly and run parallel with the segment; the dorsal pair is very long, the lateral pair
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