OF WASHINGTON. 125 



traces of pale spots on margin between the veins. Hind wings paler 

 gray, with gray fringe. Venation as in the other species. The tip of 

 male abdomen has two plates, showing from above a median emargi- 

 nation between them, in this differing from all our other species. 

 Expanse, <^, 20 mm. ; $, 25 mm. 



A male from Tabernash, Colo., August (Tucker) and female 

 from Boulder, Colo., August 9, at light (Cockerell). 



Lepidostoma stigma, n. sp. (PI. VIII, fig. 10). 



Head brown; palpi yellowish; basal joints of antennae brown, as long 

 as width of head, beyond yellowish, with narrow brown annuli; thorax 

 dark brown, four warts on pronotum; coxae dark brown, rest of legs 

 pale yellowish, with white hair, spurs pale; abdomen dark brown above, 

 pale beneath ; wings dull brownish, with scattered black hairs ; in both 

 pairs a broad streak of dark brown over the posterior fifth of radius, 

 extending up to subcosta and nearly reaching radial sector; venation 

 as figured; anal margin of hind wings with long cilia. 



Expanse, 18 mm. 



One female from Colorado (Oslar), and two from Boulder, 

 Colo., Aug. 9 (Cockerell), at light. 



Thremma deceptiva, n. sp. (PL VIII, fig. i). 



Head brown; vertex shining; a distinct ocellus over each antenna 

 and between bases; basal joint of antennae yellow-brown, scarcely as 

 long as distance from eye to eye, beyond yellowish, narrowly annulate 

 with brown ; palpi yellow, in female upturned ; thorax brown ; legs 

 pale yellowish, spurs 1-3-4; abdomen large, venter and sides pale, 

 dorsum light brown ; wings nearly hyaline ; venation brown, a large 

 elongate dark spot in stigmal region of both pairs, and a minute dot 

 in base of third apical cell. 



Expanse, 15 mm. 



One female from Beulah, New Mexico, 8,000 feet (Cock 

 erell). 



Differs from the type of the genus in longer wings and longer 

 discal cell and fork 3, and in that in the hind wings fork I is 

 present. 



Helicopsyche arizonensis, n. sp. 



Head clothed with gray hair, palpi and basal joints of the antennae 

 with brown hair, rest of antennae pale yellow, narrowly annulate with 

 brown; thorax black, with some yellowish and gray hair; abdomen 

 brown, darker above than below, legs yellowish, brownish on the basal 



