. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 165 12. Ninth sternite almost triangular, ta- pering evenly to a narrow apex, fig. 586 Oligostomis, p. 167 Ninth sternite wide at apex, figs. 593, 601 13 13. Ri markedly sinuate in both front and hind wings, fig. 578 Banksiola, p. 169 Ri nearly straight in both front and hind wings, fig. 579 Ptilostomis, p. 171 Agrypnia Curtis Agrypnia Curtis (1835^, p. 540). Genotype, monobasic: Agrypnia pagetana Curtis. Agrypnetes McLachlan (1876, p. ii). Geno- type, monobasic: Agrypnetes crassicornis Mc- Lachlan. Dasys
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 165 12. Ninth sternite almost triangular, ta- pering evenly to a narrow apex, fig. 586 Oligostomis, p. 167 Ninth sternite wide at apex, figs. 593, 601 13 13. Ri markedly sinuate in both front and hind wings, fig. 578 Banksiola, p. 169 Ri nearly straight in both front and hind wings, fig. 579 Ptilostomis, p. 171 Agrypnia Curtis Agrypnia Curtis (1835^, p. 540). Genotype, monobasic: Agrypnia pagetana Curtis. Agrypnetes McLachlan (1876, p. ii). Geno- type, monobasic: Agrypnetes crassicornis Mc- Lachlan. Dasystegia Wallengren (1880, p. 73). Geno- type, by subsequent designation of Milne (1934, p. 7): Phryganea obsoleta Hagen. Phryganomyia Banks (1907rt, p. 122). Geno- type, by original designation: Asynarchus alas- censis Banks. Prophryganea Martynov (1924, p. 210). Genotype, by original designation: Prophry- ganea principalis Martynov. Jyrvia Milne (1934, p. 3). Genotype, b\ original designation: Neuronia vestita Walker. The size, color, wing venation and vesti- ture all vary through a wide range in this genus, but the curious ninth sternite of the female, fig. 582, and the structure of the male genitalia leave no doubt but that this forms a compact generic unit well differ- entiated from the rest of the family. Only two species of the genus have been taken in Illinois. A third occurs in Wiscon- sin, and the remaining seven or eight occur to the north. Several of these occur through the subarctic regions of Alaska and Canada. KEY TO SPECIES 1. Wings almost uniformly tawny, at most with a few brownish streaks in the forewing straminea, p. 165 Front wings with a definite pattern of brown and gray; hind wings clear with an apical band of dark brown vestita, p. 166 Agrypnia straminea Hagen Agrypnia straminea Hagen (1873, p. 425); Agrypnetes curvata Banks (1900^, p. 252); d^. Phryganomyia obscura Banks (1907^, p. 122); cf. Larva.—Not reared in Illinois. A speci- men determined as this
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