Illinois Natural History Survey Bulletin Vol. 23, Art. 1 



382 C 



BIDENS 



382 D 



379 B -^ 9 



A ~ 383 B 



ORRIS 383 C 383 D 



■''l^igs. 377-383. — Hydropsyche, male genitalia. A, lateral aspect; B, dorsal aspect; C, 

 aedeagus, lateral aspect; D, aedeagus, ventral aspect. 



