PLATYPTILUS. 17 



Lower Klamath Lake, at the extreme northern part 

 of Siskiyou County, CaUfornia. 



It is not impossible that this may be found to be 

 a variety of P. shastce described above, and that the 

 difference in colour may be partly owing to the 

 bleaching effect of a hot sun on the plains where it 

 occurred, the Shasta specimen having been met with 

 under the shade of a pine-forest. The main points of 

 difference are the yellowish tint of the fore wings, the 

 browner hind wings, and the decidedly whiter legs, of 

 which the joints only are suffused. 



Platyptilus albiciliatus, sp. nov. 



(Plate I. Fig. 13.) 



Capite et])alpis cinnamomeis.floccofrontali brevi. 



Antennis griseo imnctatis. 



Alls anticis cimiamomeis, thorace, costa et margine aj)i' 

 call griseo atomosis, ciliis marginis apicalis alhidis, 

 in bast cimiamomeis ; posticis hrunneis, ciliis in 

 basi ])allidioribus. 



Tibiis et tarsis suhcinereis, pedibus ^aulo ;pallidioribus. 



Head and palpi cinnamon-brown ; frontal tuft short. 



Thorax greyish tawny. 



Fore wings cinnamon-brown, dusted towards the costa 

 and apical margin with greyish ; near the latter 

 are also a few fuscous scales. The cilia of the 



