Lepidoptera from Dutch New Guinea. 225 
Hab. Wandammen Mtns., 3000-6000 feet, Nov., 2 ¢ 3g. 
We place this provisionally in Acerbas. The fore wing 
has vein 2 from near the base, 3, 4, and 5 all near together. 
BIAKA, gen. nov. 
Allied to Pirdana, Dist. Antenne about three-fourths 
length of fore wing. Fore wing with vein 5 from below 
middle of discocellular, 3 close to 4 near angle of cell, 2 from 
below middle of cell; upper discoceliular obsolescent, farther 
from 10 than in Pirdana. Hind wing with vein 5 from 
below middle of discocellular, its proximal half obsolescent, 
4 from the angle, 3 from just below the angle, 2 opposite 6 
and farther from 3 than in Pirdana. 
Type, albidiscus, J. & T. 
Biaka albidiscus, sp. n. 
?. Upperside black-brown with a strong purple sheen. 
Fore wing with a pale discal suffusion in areas 1 6, Le, 2, and 
3, formed by a reduction of scales; some yellowish-brown 
hair below cell and on inner margin. Hind wing with some 
yellowish-brown hair in cell and in Le, and at the bases of 2, 
3, and 4; a pale postcellular suffusion formed by reduced 
scaling. 
Underside bronzy green. Fore wing with a small white 
discal patch formed of three spots in 1b, 1c, and 2; basal 
aud median area bluish purple. Hind wing with a large 
bluish-white discal patch, extending from base along lower 
half of cell, anteriorly to vein 6 and posteriorly to the inner 
margin, its distal edge curved parallel to the outer margin. 
Antenne black, club with white scaling below. Head and 
palpi black-brown mixed with yellow, first and second palpal 
segments yellow at the side; thorax black-brown clothed 
with yellowish-brown hair ; abdomen black-brown, with some 
greyish-brown hair on basal segment, laterally and ventrally 
with segments edged with white; legs black-brown on out- 
side, ochreous on inside, femora whitish on inside. 
Length of fore wing 23 mm. 
Hab, Biak, Schouten Islands, June, 1 specimen. 
We are indebted to Col. C. Swinhoe for kindly giving us 
his opinion on this very interesting species. 
. MIMENE, nom. nov. 
Mimas, de Nicéville, Journ. Bomb. Nat. Hist. Soe. vol. ix. 
