DERXENA; CELERENA. By L. B. Prout. 
41 
0. hesperias Meyr. appears slightly broader-winged, with less appreciably falcate apex; rather hespcria .•>•. 
sparsely but almost uniformly irrorated with purple-brown. New Hebrides. The types of this and the prece¬ 
ding remain unique. 
0. plana Warr. represents hesperias on the Loyalty Islands. Less irrorated, but showing traces plana. 
of two costal spots on the forewing. 
0. niphoplaca Meyr. (5 b). Quite unlike any other species. Black, the forewing with two large niphoplaca 
oval or roundish white spots, the hindwing with one very large one. Solomon Islands and Bismarck Archipelago. 
0. albimacula Warr. is another rather isolated species. Large for the genus, rather narrow-winged, albimacula 
the general coloration as in niphoplaca, but the white markings quite differently arranged, the principal patch 
of the forewing more distal, not reaching costal margin or anal angle, irregularly dentate-edged, no subapical 
patch, two small hindmarginal spots distally. Hindwing with a black cell-spot in the white patch. Obi. 
58. Genus: Derxena Walk. 
Much more delicately built than Ozola, more thinly scaled, in these respects resembling Derambila. 
from which it only differs essentially in having the costal vein of the hindwing remote from the subcostal, 
connected by a bar as in Ozola. Hindtibia of <$ dilated; of both sexes with a pair of minute terminal spurs. 
Almost confined to the Papuan sub-region, though one species reaches the Moluccas. Early stages unknown. 
D. nivea Kirsch (3g). Larger than the other species, less transparent. White, with rather large nivea. 
black cell-spots. Described from Jobi. — discata Warr. is the ordinary form from Dutch New Guinea, but discala. 
does not differ very materially. Generally larger, with the spot on the hindwing enlarged. Examples from 
Mysol appear somewhat transitional. 
D. quadrinotata Th.-Mieg (= aluaria Prout) (3g). Described by Thierry-Mieg from New Guinea quadrinota 
while my description from Solomon Islands examples was in the press. I do not think there is even a fixed 
racial difference, though in more easterly specimens the cell shows a tendency to become longer. Light blue, 
each wing with a small black cell-dot. Dutch New Guinea to the Bismarck Archipelago and Solomon Islands. 
D. coelivagata Walk. (= eoerulea Pagenst .) differs from quadrinotata, in the complete absence of coelivagaia. 
the cell-dots. Batjan, Aru, Mysol and New Guinea. 
59. Genus: Celereua Walk. 
Palpus of'moderate length or rather short, the 3rd joint smooth, cylindrical, sometimes rather elongate. 
Antenna of ciliate, usually also with a tuft of sex-scales. Thorax densely hairy beneath. Femora more 
or less hairy. Hindtibia of $ with 3 spurs, of $ with 4; the hindleg of the $ generally with a long process 
from the end of the tibia and a strong triangular swelling on the 1st tarsal joint. Forewing with the first 
two subcostals stalked, their stalk anastomosing strongly with the costal; the G generally with a deep fur¬ 
row in the cell on the underside, overhung by androconial scales or hairs. Hindwing with similar venation 
to that of Ozola. All the species are rather large or of moderate size and all are of yellow'colouring with black 
or grey borders, mostly very similar in pattern. The genus is confined to the Indo-Australian region. The 
flight is diurnal and is said to be rather sluggish. Of the early stages I have no knowledge, 
C. lerne is a brightly coloured species, distinguishable from all the others by the pure white bands 
in the broad black borders. Midcostal black streak of forewing always short. — lerne Bdv. (3 g) is the form lerne. 
from the coasts of Dutch and German New Guinea and the islands (Waigeu, Mysol, Ron). — amplimargo amplhnargo 
Prout has the black borders broader, the enclosed white bands nearly twice as broad as in typical lerne. De¬ 
scribed from the Snow r Mountains, Central Dutch New Guinea, but also occur in other mountain ranges 
of the country. 
C. cana. Paler yellow than most of the species, the borders whitish grey, the midcostal-mark much 
shorter still than in lerne. — cana Warr. has the costal mark of the forewing very small, ending in a point runa. 
midway between the subcostal vein and the cell-fold; a yellow band, 2—3 mm in width, in the proximal 
part of the grey border. Fergussoir Island. — nigrilinea Prout (5 a) has the costal spot less small, almost or nigrilinea. 
quite reaching the cell-fold; the yellow band reduced to about, 1 mm width, or wanting. Ov'en Stanley 
Range, British New Guinea. — fulvastra Prout is smaller than the other races, of a rather deeper yellow^, fulvastra. 
the black edging at base of costa of forewing narrowed, the curved dark proximal edging of marginal band 
rather broad, but not marked with a sharp line as in nigrilinea. Humboldt Bay, Dutch New' Guinea. 
