I 9 0l] 



ENTOMOLOGICAL NEWS. 



49 



(Fig. 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 sucking discs on the ventral surface of the pupa, 

 but the adherence is, nevertheless, sufficient to prevent the 



B 



Pfficoma ci'ifornica Kincaid. 

 \, 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 by April 5th, and adults were issuing at this time. Pupae 

 were 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 calif oruica that I found on July 25th in a small stream 

 in the Rocky mountains of Larimer County, Colorado, two 

 pupae evidently Psychodid but different from the pupae of the 

 California!! 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 bo-1; 

 was the same as in l\ricoma californica. 



