14 PLATTPTILFS. 



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. alMdics, 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 shastaB, sp. nov. 



(Plate I. Fig. 11.) 



Tenuis. 

 Capite albo. 



Thorace et alls anticis alMdis, cinereo atomosis, macula 

 triangulari costali hrunnea, lineola sulapicali 

 tenuissime alhida, apice costse albo, linea in hasi 

 ciliorum alhorimi hrunnea; posticis dilute cine- 

 reis, ciliis unicoloribus. 



Tihiis posticis cinereis, pedihus et calcarihus pallidi- 

 orihus. 



