504 Lord Walsingham on 



Psedisca argenteana, sp. n. (PL XII., fig. 13.) 



Antenna biciliate in the $ (scarcely |) ; pale fawn. Palpi 

 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 bylines 

 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. Z., 19 mm. Hindwings pale fawn- 

 grey ; cilia greyish white. Abdomen fawn-grey. Legs whitish. 



Type. $. Mus. Wlsm. 



Hab. Colorado Loveland, 5,000-10,000 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 wing. The description is taken from a very distinctly 

 marked specimen. 



"(^ ^Psedisca serpentana, sp. n. (PI. XII., fig. 10.) 



Antennce white, annulated with pale mouse-grey. Palpi 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-snrface ; the first of these 



