P^DISCA. 43 



streak nearly L^'eacliing the anal angle : two conspicuous spots at the costa — one beyond the 

 middle^ the other near the apex, sloping obliquely towards each other, and sometimes meeting 

 so as to leave a buff-brown triangular mark at the costa between them ; a small triangular spot 

 on the middle of the apical margin, and a rather square spot on the dorsal margin before the 

 middle ; all slightly margined with some blackish-fuscous scales : cilia whitish, tipped with 

 brown. Hind wings pale greyish brown: cilia paler. 3 d , 2?. Expanse of wings 19 

 millims. 



Mount Shasta, California, August 1871. 



This species is nearly allied to "Conchylis " agassizii, Rob. (Trans. Am. Ent. Soc. ii. p. 284) , 

 but differs from it in the absence of the costal spot near the base, and of the circular white 

 costal dot beyond the middle, moreover in the white median streak being more abruptly 

 angulated and situated somewhat more towards the costa. The dorsal margin also is not 

 white beyond the middle, as in Robinson's species. 



Psadisca crambitana. (Plate LXX. fig. 1.) 



c? . Palpi ochreous white above, ochreous at the sides : antennse ochreous ; head ochreous 

 white ; both more ochreous in the female : thorax white, with an ochreous streak down the 

 middle ; patagia ochreous. Fore wings — more than three times as long as wide ; costa 

 slightly arched ; apical margin very oblique, dorsal margin subconvex — shining silvery white^ 

 with two ochreous streaks, the first slightly arched, running from the base, touching the 

 ochreous costal fold in the male, and ending in the middle of the apical margin, with a branch 

 from above, beyond the cell, to the apex ; the second, leaving the base below the cell, is slightly 

 depressed beyond the middle to the anal angle, where it is divided by a slender silvery 

 wedge-shaped streak : the hind margin is narrowly ochreous : cilia white, tipped with 

 ochreous. Hind wings pale straw-colour in the male, cilia white ; pale greyish fuscous in 

 the female, cilia greyish white. Expanse of wings $ 33 millims., ? 26 millims. 

 Mount Shasta, California, August 1871. 



This insect reminds one curiously of a Crambus, not only by its long narrow wings, but 

 by the character of its ornamentation much resembling that of many species in the group 

 which includes that genus. 



It may perhaps be worthy of remark that whereas Wilkinson and other authors frequently 

 mention the colour of the eyes in their descriptions of new species, we have in this species a 

 proof that such observations are of little or no value ; for in the female specimen described 

 above the eyes are pale ochreous grey, whereas in the male they are black ; moreover I have 

 in my own collection another female of the same species, of which the eyes are black, showing 

 that in this case at least it is a mere variation, and not even a sexual distinction. 



Psedisca larana. (Plate LXX. fig. 2.) 



Head, palpi, antennse, and thorax chalky white. Eore wing — with the costal fold in the 

 male closely appressed — chalky white, very sparsely irrorated with minute black scales ; the 



g2 



