August, 1944 



Ross: Caddis Flies of Illinois 



157 



554 A 



MINUTISIMELLA 



555 A 



COLLATA 



Figs. 550-556. — Neotrichia, female genitalia. A, eighth sternite; 5, bursa copulatrix. 



13. Apex of bursa copulatrix forming a 



long, narrow, tapered rod, figs. 554, 



555 14 



Apex of bursa copulatrix forming a 

 wide, bilobed structure, fig. 556. . . 15 



14. Median portion of bursa copulatrix 



with a pair of sclerotized projections 



at base of apical rod, fig. 554 



tninutisimella, p. 157 



Median portion of bursa copulatrix en- 

 tirely membranous, without pro- 

 jections, fig. 555 collata, p. 159 



15. Eighth sternite sclerotized and dark- 



ened to form a distinct V, fig. 556. . 



okopa, p. 158 



Eighth sternite slightly sclerotized but 

 not darkened; without an evident 

 V-shaped pattern vibrans, p. 159 



Neotrichia minutisimella (Chambers) 



Cyllene minutisimella Chambers (1873, p. 

 125); cf. 



Larva (mature type). — In general shape 

 similar to fig. 557. Length 2 mm. Head 

 somewhat cone shaped, narrowed toward 

 front. Legs short but slender. Abdomen 

 abruptly enlarged at juncture of thorax, the 

 second segment slightly the widest and the 

 abdomen tapering almost evenly from that 

 point to the end; lateral margins with a 

 delicate, small fringe of hair. Anal hooks 

 situated on short, stubby but distinct "legs." 



Case. — Short and elliptic, tapered at the 

 base without a bottom opening; composed 



