PyEDISCA. 
43 
streak nearly reaching 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 6, 2?. Expanse of wings 19 
millims. 
Mount Shasta, California, August 1871. 
This species is nearly allied to "Concliylis " 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. 
Psedisca cramljitana. (Plate LXX. fig. 1.) 
^ . Palpi ochreous wdiite above, ochreous at the sides : antennae ochreous ; head oehreous 
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; ajiical 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 oehreous : 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 o£ 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 
pi-oof 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, antennae, and thorax chalky white. Fore wing — with the costal fold in the 
male closely appressed — chalky white, very sparsely irrorated with minute black scales ; the 
