ACIPTILUS. 59 



Several specimens taken, from the middle to the 

 end of June 1871, in Mendocino and Lake Counties, 

 California. 



The species has much the appearance of Lwptilus 

 lienigianus, Zell. ; but the second lobe of the hind 

 wings is decidedly narrower, the fissure being longer, 

 and the spurs of the posterior tibiae shorter and of 

 more equal length. It is more nearly allied to 

 L. inulw, Zell., for specimens of which I am indebted 

 to the kindness of Prof. Zeller. 



Aciptilus montanus, sp. nov. 

 (Plate III. Fig. 14.) 



Caj)ite niveo, antennis supra dilute punctatis. 



Alis anticis niveis, ferrugineo sparse atomosts, litura 

 ante fissuram ferruginea^ cum lituris costalibus 

 lacinice anterioris simUihus connexa, ciliis niveis 

 (ciliis extremis suhapicalihus exceptis ferrugineis), 

 lacinim posterioris dimidio externo costali et ciliis 

 suhapicalihus ferrugineis, aliis niveis ; posticis 

 cinereo atomosis, lacinia tertia dilutiore. 



Abdomine et tihiis niveis. 



Head white; antennae white, faintly dotted above 

 with brownish. 



Fore wings cleft to nearly half their length, snow- 

 white, sparsely dusted with ferruginous-brown 



