i90i] 



ENTOMOLOGICAL NEWS. 



49 



(Vig. 2, B). The dorsal wall of the pupa is firm, being fairly 

 strongly chitinized. The flat ventral surface adherent to the 

 rock is unchitinized, and the folded wings and legs lie uncov- 

 ered, although of course perfectly protected by the dorsal wall. 

 There are no suckitig discs on the ventral surface of the pupa, 

 but the adherence is, nevertheless, sufficient to prevent the 



Pericoma cii'i/ornica Kincaid. 

 A, ventral aspect ; B, dorsal aspect. 



pupae from being carried away by the occasional splashes of 

 water which strike them. The pupae were more plentiful than 

 larvae b}^ April 5th, and adults were issuing at this time. Pupae 

 w'ere found, however, at the .same time, March ist, that the 

 larvae were first noted. 



I may add to this brief account of the immature stages of 

 Pericoma californica that I found on July 25th in a small stream 

 in the Rocky mountains of Larimer Count)^ Colorado, two 

 pupae evidently PsycJwdid but different from the pupae of the 

 Californian Pericoma. The prothoracic breathing tubes of the 

 Colorado form were long and tapering and flexible ; the shape 

 and general flat shield-shaped adherent character of the body 

 was the .same as in Pericoma californica . 



