August, 1944 



Ross: Caddis Flies of Illinois 



127 



B, and E short, tapering evenly to 



pointed apex, fig. 469 



contorta, p. 131 



Sclerite A much narrower, D removed 

 at least its own length from spiral 

 of B, E long, obliquely truncate at 

 apex and much closer to apex of F, 

 fig. 470 anisca, p. 131 



8. Claspers with a row of 4 or 5 long, 



stout, evenly spaced, black spines 



at middle shoulder, fig. 473 9 



Claspers with black spines irregular or 

 clustered at middle shoulder, figs. 

 475-477 10 



9. Hook of tenth tergite large and reach- 



ing beyond sclerite B\ sclerites C and 



D both slender, fig. 473. . . .riesi, p. 132 

 Hook of tenth tergite small, sclerite B 

 extending considerably beyond it; 

 sclerite C very slender, sclerite D 



shorter and stout, fig. 474 



conf usa, p. 1 33 



10. Right clasper with middle of ventral 



portion angulate; the angle bears a 

 spine well separated from the others, 



fig. 475 spinosa, p. 132 



Right clasper with middle of ventral 

 portion evenly sinuate, fig. 476. . . 11 



11. Apex of claspers with a row of 4 to 6 



black, peglike spines on the mesal 

 face of the caudo-ventral arc, fig. 

 476 eliaga, p. 132 



468 D 



469 D 



CONTORTA 



470D 



ANISCA 



47ID 



TARSALIS 



472D 



STYLATA 



Figs. 466-472. — Ochrotrichia, male genitalia. A, lateral aspect; B, dorsal aspect; C, ventral 

 aspect; D, tenth tergite, dorsal aspect; F, aedeagus. 



