MICROLEPID OPTEBA OF NEW GUINEA 
13 
Hemiarcha melanogastra spec. nov. (figs. 561, 562, 563) 
fieXag = black, yatmjg = abdomen 
g 19 mm. Head and thorax (damaged) white, vertex slightly mixed 
with fuscous, shoulder suffused with ferruginous. Antenna white, faintly 
ringed with brownish, base of the flagellum and the scape brownish below. 
Palpus whitish, basal segment with the apical half dark brown, median 
segment with a triangular projecting tuft at the apex below: dark brown, 
a sub basal ring and the apex, white; terminal segment with a narrow 
subbasal dark brown ring, posterior 3 / 4 pale brownish, with the upper edge 
narrowly brown, with two faint narrow whitish rings. Abdomen brownish- 
black, anal tuft whitish-ochreous, venter suffusedly whitish-ochreous. 
Legs blackish-fuscous, posterior coxa and the articulations of the tarsal 
segments, whitish-ochreous. Fore wing elongate-sublanceolate, moderately 
broad, hardly dilated, costa curved anteriorly, with an appressed thick 
truncate tuft of scales from the base to 1 / 3 , a much smaller second tuft in 
the middle, costa concave in the middle, concavity smooth, accentuated 
by roughish cilia along the posterior third of the costa, which is obliquely 
curved, with the apex somewhat projecting, pointed, termen rounded, 
oblique. White, costal tufts greyish-fuscous, becoming paler towards their 
apex which is white, along the costal edge tinged ferruginous; a narrow 
elongate-semiovate spot along the costal concavity, brownish, suffused 
with dark ferruginous, reaching from the middle to 2 / 3 of the costa, with 
the lower edge irregular; an irregular equilateral triangular spot of cloudy 
brownish suffusion, coarsely dotted with blackish -fuscous, extending along 
the costa from 4 / 5 to before the apex; a small spot of blackish irroration 
in the middle of the disc just beyond the base ; irregular transverse strigulae 
of fuscous irroration along about the median half of the wing, running 
outwardly from below the costa to the middle of the disc, thence ill-defined, 
inwardly oblique to the fold, outwardly oblique from the fold to the 
dorsum, one of these strigulae forming a small suffusion on the middle of 
the dorsum; a moderate, suffused brownish marginal streak from the sub- 
apical costal patch to the apex and along the termen to the tornus, 
moderately narrowed below ; a few dark fuscous scales scattered below 
the middle of the costa, obscuring transverse strigulae. Cilia black, 
slightly mixed with white, with the base white. Hind wing glossy fuscous- 
grey, cilia grey with the base narrowly whitish. 
(Genitalia damaged and broken to parts.) Tegumen elongate. Uncus 
moderate, clavate, bristled ventrally at the base. Gnathos with very short 
arms and a long, curved hook. \ alva narrow, cucullus dilated, sub- 
rectangular, harpe, a small bristled knob, sacculus indefinite, a series of 
large but weakly sclerotized bristles. Aedoeagus curved, slender, with a 
bulbate base. (Slide no. 963 D, type.) 
Mist Camp, 1800 m, January 12, 1939. One specimen. 
