90 AMERICAN I.KPIDOPTERA. 



Forewing: wliito, overlaid with pale gray, especially between the veins; with 

 a darker basal shade, large dark crescent-shaped spot on lower half of wing be- 

 fore anal angle and a darker terminal patch. The basal area is light brown 

 dotted with dark brown, it is edged outwardly with an oblique line of dark 

 brown dashes, interrupted on the veins, it begins at outer third of dorsum and is 

 defined only to upper third of wing. A gray shade in the upper third of wing 

 extends from base to end of cell. The crescentiform spot is broadest on dorsum, 

 its upper end curving inward, hook-shaped, it is inwardly edged with dark brown 

 dots and a cluster of the same on its outer edge. Before the termen are two ver- 

 tical irregalar lines of brown dots. There is a large quadrate brown spot in apex, 

 and a similar but paler one on lower third of termen. Costa white, dotted with 

 dark brown. Cilia whitish, gray at base. 



Hindwing: light grayish-fuscous, cilia whitish, with darker line near base; 

 underside lighter. 



Underside forewing: smoky gray, costa darker dotted with white. 



One S specimen : Blackfoot, Idaho, June 3d, Arthur J. Snyder. 



Euco^nia idahoaiia sp. nov. 



Expanse 21 mm. 



Head, palpi and thorax olivaceous-yellow, posterior sides of thorax edged with 

 silver; antenna cream-white, annulated with olivaceous; abdomen light oliva- 

 ceous-gray; legs whitish, dusted with dark brown. 



Forewing: olivaceous-yellow, with horizontal silver lines. The costa, beyond 

 male fold, is silver, interrupted by two spots, one beyond end of cell and one be- 

 fore apex. A line from base to end of cell through middle of cell, a duplicate 

 line above its outer half, the ground color between the two dotted with brown. 

 A silver line on outer half of fold and another the whole length of vein 16. Be- 

 yond the cell, between veins 3 and 8, the spaces between veins is silver, the veins 

 being dotted with brown. There is a silver terminal line, edged outward nar- 

 rowly with dark brown and inwai'd with a line of olivaceous yellow. The apical 

 and subapical spots of ground color are dotted with dark brown, and a line of the 

 same are above and below the silver line in outer fourth of fold. Cilia yellowish- 

 white. 



Hindwing: light smoky gray, cilia whitish ; underside the same. 



Underside forewing: olivaceous-gray, whitish on costal and terminal edge, 

 cilia whitish. 



One $ specimen : Blackfoot, Idaho, June 3d, Arthur J. Snyder. 



Encosma vomonana sp. nov. 



Expanse 15-17 mm. 



Head light ferruginous-brown, darker over eyes and around collar, palpi gray- 

 ish-brown, blackish on outside and outer joint; antenna gray; thorax blackish in 

 center, patagia brown at base, striped with pink and white outwardly ; thorax 

 cinereous gray; legs yellowish-white, dusted with dark brown. 



Forewing: light gray, with a brownish tinge, the tips of the scales are some- 

 what paler, giving a speckled appearance under a lens. On the middle of dorsum 

 is a broad white patch, with three brown dots on dorsal edge, it is broadest at 

 base, the inner edge is outwardly oblique, the outer edge nearly vertical, it ex- 



