62 TRICHOPTILUS. 



Abdomen brown, with three pairs of slender, diverg- 

 ing, whitish streaks. 



Legs brown, striped and annulated with white ; the 

 spurs white. 



Expanse 17 millims. 



Met with in Mendocino, Colusa, and Shasta Counties, 

 California, June and July 1871. 



It differs from the ordinary form of the genus 

 Aciptilus in having a tuft of projecting scales in the 

 fringes of the third lobe of the hind wings, and in 

 this it approaches the new genus hereinafter cha- 

 racterized under the name of Trichoptilus ; but the 

 projecting scales in this species are nearer to the 

 apex, and the fore wings are less deeply cleft. Its 

 nearest European ally is probably A. siceliota, Zell. 

 (Isis, 1847, p. 907). 



TRICHOPTILUS, gen. nov. 



Aciptilo affinis. 



Antennce pubescentes, articulo basalt incrassato; floccus 

 front alls nullus. 



Palpi capite longiores, tenues, articulo secundo vix 

 fortiore guam apicalis. 



Pedes sat robusti. 



Tibice posticce nodis duobus penicillo supra ornatis ; 



calcaribus primis poene paribm, secundis brevi- 



oribus. 



