20 AMERICAN LEPIDOPTERA. 



side yellowish. Legs more or less densely tinged with fuscous, espe- 

 cially the anterior ; tarsal joints scarcely paler at apex. Expansion 

 15.0-18.0 mm., 0.6-0.72 mm. 



Hab. — Colorado, Denver. 



Two cf d\ in the Nat. Mus. Coll., collected by E. Oslar. 

 One of these is minus its left fore- and hindwing, which are 

 contained in a slide ; the other is minus its left forewing. 

 The pale, yellowish color distinguishes this species at once 

 from all others at present known to the writer. I retain the 

 MSS. name given it by Mr. Busck. 



EURESIA gen. n. 

 Type pnlebella. 



Labial palpi long, diverging, pending (in the dead insect), 

 second joint rather thick, roughened beneath with scales, 

 third joint shorter than the second, slender, and like the latter 

 roughened beneath with scales. Antennae (&) shorter than 

 the forewing ; basal joint short and broad, pecten setaceous, 

 shaft deeply excised above the base, neither denticulate or 

 ciliate beneath. Forewings moderately elongate, pointed, 

 twelve veins, vein 7 + 8 stemmed, 7 to costa, remaining 

 veins free, but crowded at end of cell, posterior angle of 

 latter very close to dorsal margin. Hindwings much nar- 

 rower than the forewings, lanceolate, pointed, costa slightly 

 refuse in outer half, cilia long ; eight veins, vein 4 before 

 angle of cell, 5 + 6 free. Posterior tibia rough haired above. 



Represented by a very small species strongly resembling 

 and readily to be taken for a Pigritia. Distinguished from 

 the latter by its long palpi and hindwings with eight veins. 

 From the other genera of Blastobases with eight veins in the 

 hindwing, by veins 2, 3 + 4 of the latter arising from the 

 posterior median vein. 



E. pulchella n. sp. (Plate II, figs. 12, \2a. )— Palpi ochreous, 

 dusted with fuscous without and within, leaving apices of joints pale. 

 Head ochreous, lightly touched with fuscous. Antennae fuscous- 

 brown, excised above base, basal joint ochreous, tinged with fuscous, 

 pecten gray. Thorax ochreous-fuscous. Ground color of forewings 

 pale ochreous-brown, a rather wide, silver white fascia at one-third, 

 not sharply defined within, more so externally, approximately straight 



