LIOPTILITS. 45 



having a few erect scales projecting on its inner 

 side. 



Fore wings very pale brownish grey, so exactly bone- 

 colour as to make me regret that the name 

 '' osteodadf/lus'' is preoccupied. There is no 

 spot at the base of the fissure, and the only trace 

 of markings on the fore wings are some very 

 slender lines, sUghtly darker than the ground- 

 colour, which follow the veins on the dorsal half 

 of the fore wings, diverging from the base and 

 attaining the opposite margins of the second 

 lobe below the base of the fissure. The cilia of 

 the fore wings are perhaps a shade paler than 

 the ground-colour of the wings themselves. 



The hind wings very slightly darker, showing rather 

 more of the brownish or cinereous tinge. Cilia 

 the same. 



Abdomen faintly tinged with yellowish. 



The legs yellowish white. 



On the underside all the wings are brownish grey, 

 the costal margin of the fore wings only being 

 slightly paler. 



Expanse 19 millims. 



Southern borders of Mendocino County, California, 

 May 25th, 1872. A specimen taken at Washington, 

 in the beginning of May 1871, shows that this species 

 is not confined to the Western States. 



