6 PLATYPTILUS. 



Siskiyou Mountains, California, June 1872. 



Distinguished from P. hertrami by its brown head 

 and frontal tuft, and by the darker cilia of the 

 apical margin, as well as by its more uniformly 

 brownish colour. 



Platyptilus grandis, sp. nov. 



(Plate I. Fig. 5.) 



Capite, palpis et flocco front ali bred dilute cervinis. 



Alls cmticis costa, punctis duohus elongatis ante 

 medium et macula triangulari costali ante fissu- 

 ram hrunneo-fuscis, regione apicali adumhrata, 

 lineola siihapicali et ciliis jjallidioribus, ciliis 

 in sinu marginis dorsal is et ad angulum anal em 

 hrunneo-fuscis ; p)Osticis dilute brunneo-cervinis. 



Head, palpi, and frontal tuft pale fawn-colour, the 

 latter shorter than in the smaller allied species, 

 P. bertrami and P. adustus ; antennae fawn- 

 brown, faintly spotted on their upperside. 



Anterior wings pale fawn-colour ; the costa tinged 

 with brownish fuscous as far as the triangular 

 costal blotch before the fissure, which is of the 

 same colour ; two brownish-fuscous elongated 

 dots are situated before the middle of the wing, 

 the lower one of these being nearest to the base. 

 Beyond the costal triangle, after a pale intervening 

 space, the lobes above and below the fissure are 

 shaded with fawn-brown to the apical margin, 



