14 PLATYPTILUS. 



Separated from the two preceding species by its 

 much larger size as well as by the more slender and 

 more oblique pale line near the apical margin. 



The dark costal shade is wider at its junction with 

 the triangular costal patch. 



The pale bases of the cilia of the hind wings sepa- 

 rate it more particularly from P. allidus, and the 

 whiter fore wings and more uniformly cinereous legs 

 from P. orthocarpi. 



Three specimens occurred (June 10th and 16th, 

 1871) in Mendocino and Lake Counties, California. 



I have met with no intermediate connecting links 

 between this species and its near allies either in size 

 or colour. 



Platyptilus shastse, sp. nov. 



(PLATE I. FlG. 11.) 



Tenuis. 

 Capite albo. 



Thorace et alis anticis albidis, cinereo atomosis, macula 

 triangulari costali brunnea, lineola subapicali 

 tenuissime albida, apice costse albo, linea in basi 

 ciliorum alborum brunnea; posticis dilute cine- 

 reis, ciliis unicoloribus. 



Tibiis posticis cinereis, pedibus et calcaribus pallidi- 

 oribus. 



