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 species by Elkins, 

 loaned through the courtesy of Professor C. 

 E. Mickel, University of Minnesota, ap- 

 pears identical with our specimens of Bank- 

 siola selina (see p. 169). 



Adults. — Length 14 mm. Head, body 

 and appendages almost uniformly yellowish 

 brown, the front wings with a few slightly 

 darker streaks and with a very fine and faint 

 pattern of irrorations. Legs with only a 

 scattering of short, tawny spines. Male gen- 

 italia, fig. 580: ninth segment with a pair 

 of slightly projecting lateral areas, each 

 bearing a brush of long setae; tenth tergite 

 almost hemicylindrical ; claspers with a large 



Figs. 580-581. — Agrypnia, male genitalia. 



583 



VESTITA 



Figs. 582-583. — Agrypnia, female genitalia. 



