16 PLATYPTILUS. 



among plants of Arnica angustifolia, at an elevation 

 of about 6700 feet, on Mt. Shasta, California, in 

 August 1871. 



Platyptilus frag-ilis, sp. nov. 

 (Plate I. Fig. 12.) 



Capite^ thorace et alis ant wis suhochraceo-albidis, ma- 

 cula triangularis punctis duohus ante medium et 

 linea in hasi ciliorum marginis apicalis brminew. 



Alis post ids dilute brumieis, Giliis pallidiorihus. 



Tibiis jposticis albidis, articulis brunneo dilute stiff usis. 



Head and thorax yellowish white ; the palpi touched 

 with cinereous. 



Fore wings yellowish white, with the two antemedian 

 spots distinctly indicated ; these and the trian- 

 gular costal patch brown. The apical margin 

 brownish, the brown line running slightly within 

 the cilia scarcely at their extreme base ; two 

 small brownish dots in the cilia of the dorsal 

 margin before the anal angle. 



Hind wings very pale brown, with paler cilia. 



Abdomen and legs yellowish white, the joints only 

 slightly suiFused with brownish. 



Expanse 19 millims. 



Two specimens taken (September 7th, 1871) near 



