August, 1944 



Ross: Caddis Flies of Illinois 



129 



481 C 



ELIAGA 



Figs. 478-484. — Ochrotrichia, female genitalia. A, eighth sternite; B, eighth segment, 

 lateral aspect; C, tenth segment, dorsal aspect. 



distinct, figs. 480, 484 14 



14. Internal structure of eighth sternite 



with surface membranous and in- 

 distinct, fig. 480 



shawnee, p. 131 ; anisca, p. 131 



Internal structure of eighth sternite 

 with surface sclerotized and reticu- 

 late, figs. 481-484 15 



15. Eighth sternite with apical margin 



distinct, separating it from ninth, 



fig. 481 16 



Eighth sternite with apical margin 

 merging with ninth sternite so that 

 the division between the two is oblit- 

 erated, fig. 483 17 



16. Internal structure of eighth sternite 



short, reaching about middle of seg- 



ment, fig. 481 riesi, p. 132 



Internal structure of eighth sternite 

 long, reaching almost to base of seg- 

 ment, fig. 482 confusa, p. 133 



17. Internal structure of eighth sternite 

 short, reaching only two-thirds dis- 

 tance to base, fig. 483. . . . eliaga, p. 132 

 Internal structure of eighth sternite 

 long, reaching well beyond base of 

 segment, fig. 484 spinosa, p. 132 



Ochrotrichia unio (Ross) 



Polytrichia unio Ross (1941i^, p. 56); cf, 9. 



Larva. — Fig. 465. Length 4 mm. Head 

 and thoracic sclerites dark brown, shading 



