31 



Described from seven examples taken in Marshall's Pass, Colo- 

 rado, July 15, 1888, and one taken in Colorado by Bruce. None 

 of these are in very good condition. 



A variety in the National Museum, from Placer County, Cali- 

 fornia, has both lobes of the fore wings completely overlaid with 

 white scales. 



Named for Mr. R. A. Cooley, a most conscientious and faithful 

 worker in entomology, to whom I am indebted not only for the 

 careful and accurate drawings of the genitalia and other structural 

 characters in this paper, but also for valuable assistance in other 

 entomological work. 



PLATYPTILIA MODESTA. 



Platyptilus modestus Wlsm., Pter. Cal. and Ore., p. 18, Plate I., fig. 14 



(1880). 



As I have no example of this species, I give a copy of Lord 

 Walsiugham's description : 



"Head and palpi cinereous; antennae slightly dotted above. 



"Fore wings very narrow, cinereous, with a slight ochreous 

 tinge towards the dorsal margin. The costa sprinkled and shaded 

 with fuscous, the fuscous shade widening towards the fissure, form- 

 ing an elongate but indistinct triangular costal blotch. The apical 

 portion of the wing more or less shaded with fuscous, and a fus- 

 cous line along the base of the cilia on the apical margin, which 

 are whitish at their points. The cilia within the fissure and those 

 along the dorsal margin before the anal angle white, the latter con- 

 taining a few dark scales. Hind wings cinereous ; the cilia slightly 

 paler, especially along their bases. Posterior legs cinereous ; the 

 feet slightly paler. Expanse 22 mm." 



Habitat. California. Early stages and food plant unknown. 



PLATYPTILIA PETRODACTYLA. 



Pterophorus petrodactylus Walk., Cat. Lep. Het., Vol. XXX., 



pp. 940, 941 (1864). 

 Platyptilus petrodactylus Wlsm., Pter. Cal. and Ore., p. 20, 



Plate II., fig. 15 (1880). 



Expanse of wings, 23 mm. Head, thorax and abdomen shaded 

 cinereous. Legs cinereous, slightly thickened at the joints; the 

 spurs apparently of equal length. 



Fore wings white, shaded with cinereous or ashy brown ; costa 

 brownish beyond the middle ; an oblique brownish fuscous line, 



