504 
Lord Waisingham on 
Psedisca argenteana, sp. n. (PL XII., fig. 13.) 
AntenncB biciliate in the <^ (scarcely ^) ; pale fawn. Paljjl 
whitish, tinged with pale fawn-colour. Head and Thorax pale 
fawn, the latter with silvery white longitudinal streaks on either 
side of the middle. Forewings pale fawn-ochreous, with shining 
silvery white streaks longitudinally ; one commencing near the 
base of the costal margin follows it to two-thirds of the wing- 
length, thence obliquely depressed towards the middle of the apical 
margin (without however reaching it), whence it is broken by lines 
of scattered brown scales into three longitudinal striae, the lower 
one curving back to the lower extremity of the cell and there nearly 
meeting a conspicuous shining white streak which comes straight 
from the base along the cell ; above the outer half of this latter 
lies a shorter parallel shining white streak ; half-way between the 
fold and the dorsal margin is another shining white streak coming 
from the base and reaching to the commencement of the dorsal 
cilia; the extreme dorsal margin below it, and the outer half of the 
fold above it being also streaked with shining white, margined at 
its outer extremity by brown scales ; on the costal margin before 
the apex is a semicircular shining white streak enclosing an ovate 
spot of the ochreous ground-colour ; along the apical margin is a 
narrow shining white band, separated from the shining white cilia 
by a slender brown line. Exp. al., 19 mm. Hindvnngs pale fawn- 
grey ; cilia greyish white. Abdomen fawn-grey. Legs whitish. 
Type. $ . Mus. Wlsm. 
Hab. Colorado— Loveland, 6,000-10,000 feet, July, 
1891 ; eight specimens (Smith). 
I find the markings of this species somewhat variable 
and frequently almost obliterated on the outer half of 
the v^ing. The description is taken from a very distinctly 
marked specimen. 
Pdedisca serpentana, sp. n. (PI. XII., fig. 10.) 
AntenncB white, annulated with pale mouse-grey. PaljJi pro- 
jecting fully the length of the head beyond it, the long hairs of 
the second outreaching the short apical joint ; white, slightly 
shaded at the sides. Head white. Thorax creamy white. Fore- 
wings mouse-grey, speckled with whitish about the outer end of 
the cell, inclining to fawn ochreous around the edges of the shining 
white bands which traverse the wing-surface ; the first of these 
