NEW (UlOMETItlU MOTHS— WARREN. 50^ 



Head, thorax, and abdomen pale gray dusted with darker; shoulders 

 black with their base white; vertex, collar, and basal segment of 

 antenna' white; palpi black. 



Ki'paihse of irliKjs. — 48 mm. 



Locality. — St. Laurent, Maroni River, French (iuiana; 1 male, Sep- 

 tember, I9()i. 



Tyj?e.— Cat. No. imi, U.S.N.M. 



Genus IDIALCIS, new genus. 



Forewlixj. — Narrow, elongate; costa slightly curved; hind margin 

 obliquel}' curved, creiudate. 



ITInd'wlng. — Elongate; inner margin short; hind margin straight 

 from anal angle to vein 4, thence rounded. 



Antenna? of male bipectinate, the pectinations well separated, not so 

 oblique as usual and ciliated; palpi porrect, short; tongue and frenu- 

 lum present; no fovea in forewing. 



Neuration. — Forewing, cell quite half as long as wing; discocellular 

 vertical; first median nervule at four-fifths; second close to third; 

 radials normal; T, 8, 9 stalked; 10 and 11 stalked or coincident, 10 on 

 the joint stalk anastomosing with 8, 9; hindwing, costal, and subcostal 

 approximated for nearh' the whole length of cell; 7 from close to 

 upper angle, 3 from well before lower angle; no radial. 



Type. — Idialcis jacintha Butler {Phihalaptery,r). 



The insects have the appearance of Tephroclystl.a and without exami- 

 nation the costal and subcostal of hind wings appear to anastomose, 

 but there is no radial in hindwing. 



IDIALCIS MEXICUBA, new species. 



Foreirlnc/. — Brownish gray, speckled with darker, the wing present- 

 ing a rough appearance, as in tS'.y'ffrmo.w Warren; the costa with dark 

 striations; the lines obscure; first from one-fourth of costa curved 

 inward to near base of inner margin, preceded by a similar line; outer 

 line dark brown, from four-fifths of costa, oblique inward to below 7, 

 then outcurved, and from 6 obliquely curved inward to middle of inner 

 margin, emitting baseward black teeth along the veins and followed 

 by a distinct brown shade; median line difi'use, bent out round the 

 linear black cell spot and better marked a])ove inner margin where it 

 approaches outer line; submarginal line whitish, waved, followed b}^ a 

 brown-gray shade and preceded ])y a paler space; a dark marginal 

 festooned line; fringe brown-gray. 



Hindiiiing. — Paler toward costa; a blackish line at base; a gray 

 antemedian line before the dark cell spot, the rest as in forewing. 



Underside of forewing olive-cinereous, with the costa striated, and 

 a dark marginal border and cell spot; hindwing dull whitish, speckled 

 with olive-gray. 



