2:38 
B. Prout on the 
(varying in individual specimens); M* from very near or 
even connate, curved almost as in forewing ; submedian area 
ample, SM^ normal, running to termen. 
Type of the genus: Neochesias opistlioleuca, Prout, 
nov. sp. 
In spite of an evidently close relationship to Chesias 
and Lithostege, as shown by frons, antenna, foretibia, etc., 
the genus differs not only from these, but from the whole 
of the group (Warren’s Eucestiinae) in the broad hindwing, 
with submedian area (and therefore SRP) normally devel¬ 
oped, in the extreme curvature of of both wings, and 
superficially in the general facies. Its allies, moreover, 
have the cell of hindwing less (usually much less) than 
one-half the wing-length, at least in its anterior portion.* 
59. Neochesias opistholeuca (Prout), nov. sp. 
(Plate XLVIII, fig. 38.) 
. 30-32 mm. Head, face, thorax and legs fuscous, more or less 
sprinkled with whitish; thorax whitish beneath; abdomen pale. 
Forewing fuscous, irrorated with whitish, and slightly clouded with 
darker fuscous ; basal area traversed by several obscure wavy lines, 
sometimes in part obliterated by the dark clouding; antemedian 
line from before one-half costa to one-half inner margin, rather 
direct, but more waved in some specimens than in others ; post¬ 
median from just beyond two-thirds costa to beyond four-fifths inner 
margin, more or less angulated outwards in middle ; the enclosed 
median area not traversed by dark lines, but sometimes dark-clouded 
distally to antemedian line ; postmedian line followed by a narrow, 
bisected pale band, as in many Larentiid genera ; subterminal area 
with some obscure wavy bands; traces of a short, ill-defined,oblique 
dark mark at apex ; a terminal dark line or series of dashes, inter¬ 
rupted at the vein-end.s. Hindwing white, unmarked, with indi¬ 
cations of a dark terminal line, distinct only about apex. Underside 
of furewing jiale, almost unmarked, excepting a dark mark at costa 
representing the commencement of the postmedian line, sometimes 
also a lighter, browner mark midway between this and apex; of 
hindwing white, unmarked. 
Aristides Villanueva. September 12,1905 (W. M. Bayne). 
Type in coll. L. B. Prout, Another $ from La Paz, 
* If the Stamnodes-Gallipia group really belongs to the Euces¬ 
tiinae,” it is necessary to add this last clause, as they have the 
biangulate discocellulars, with consequent prolongation of the cell 
in its lower (posterior) half. 
