August, 1944 



Ross: Caddis Flies of Illinois 



135 



138 



Apex of eighth segment only minutely 

 serrate; claspers not projecting and 

 upturned, fig. 489 



6. Apex ot aedeagus bulbous, with both 



apical processes smooth, the larger 

 one short and stout; plate formed 



by claspers narrow, fig. 488 



grisea, p. 



Apex of aedeagus only slightly en- 

 larged, with a long, smooth process 

 and a round, platelike, serrate one; 

 plate formed by claspers much 

 wider, fig. 489 novasota, p. 138 



7. Ninth sternite produced to form a 



long, narrow, ventral internal plate 

 which is four or five times as long as 



the posterior part of the segment, 



fig. 490 zeronia, p. 139 



Ninth sternite not produced into such 

 a long plate, the interna! narrowed 

 part never more than twice the 

 length of posterior portion of seg- 

 ment, fig. 491 8 



.Aedeagus with a long, stout tooth 



just beyond neck, fig. 491 



verna, p. 1 39 



Aedeagus without a tooth; at most 

 with a short, slender thread, fig. 492 9 



Aedeagus with a neck, a weak, slender 

 thread and a slender apex tipped 



with a small plate, fig. 492 



forcipata, p. 139 



Figs. 491-493. — Oxyethira, male genitalia, 

 aspect; D, aedeagus. 



OUALIS 

 4, lateral aspect; 5, ventral aspect; C, dorsal 



