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 

 Acijptilus 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. 



A^itenncB puhescentes, articulo basalt incrassato; floccus 

 frontalis nullus. 



Palpi cayite longiores, tenues, articulo secundo vix 

 fortiore quam apicalis. 



Pedes sat rohusti. 



Tibice posticce nodis duobus penicillo supra ornatis ; 

 calcaribus primis pcene paribus, secundis brevi- 

 oribus. 



