NEW NORTH-EASTERN SUMATRA BUTTERFLIES. 53 
13. DELIAS DATAMES, n. sp., Pl. L, Fig. 8, @. 
Hasirat: Battak Mountains, Sumatra. 
EXPANSE: ¢, 2°83 inches, 
DESCRIPTION: Mae. UPppErstpn, forewing dead chalky-white ; the costa 
as far as the subcostal nervure, the apex very broadly reaching almost to the end 
of the discoidal cell, and the outer margin decreasingly, black, bearing a series of 
five prominent small round white spots, of which the fourth from the costa is 
the smallest, the fifth the largest ; the disco-cellular nervules defined with black, 
Hindwing white, but not of as pure a shade as in the forewing, the black 
colour of the underside appearing to show through by transparency, especially 
at the base of the wing, and broadly along the outer margin, where it may 
almost be said that the wing has a broad outer diffused blackish border, more 
intense anteriorly. UNDERSIDE, forewing with the inner margin broadly white, 
eradually merging in the submedian interspace into the yellow colour of the 
disc and base ; the black apical and outer marginal areas much as on the 
upperside, bub extending narrowly into the outer end of the cell ; bearing six 
submarginal spots, of which the two anterior ones are clear yellow, the rest 
white ; there is also a second white spot in the lower discoidal interspace mid- 
way between the submarginal spot and the lower disco-cellular nervule ; the 
base and disc of the wing reaching anteriorly to the costal nervure clear yellow. 
Hindwing dull bronzy-black throughout except a small streak of clear yellow 
anterior to the costal nervure ; a submarginal series of six small clear yellow 
spots placed between the veins, the one in the submedian interspace geminated, 
This species is perhaps one of the most remarkable in the genus. On the 
upperside it has somewhat the appearance of Huphina nama, Moore, which I 
have also from the mountains of Sumatra, and for which it would certainly 
pass without notice when flying. D. datames is very closely allied to D. momea, 
Boisduval, from Java, the male differing from the same sex of that species in 
the costa of the forewing being black up to the subcostal nervure instead of 
white, the black apical area of greater extent and reaching the inner angle, 
which it does not do in D. momea ; in the hindwing the black powdery outer 
border is unmarked, in D. momea it bears three white spots placed one in each 
interspace between the second median and second subcostal nervules ; on the 
underside of the forewing the yellow coloration is of a deeper shade, and is 
more extensive, in D, momea the white coloration of the inner margin extends 
outwardly as far as the second median interspace, thus greatly reducing the 
yellow area ; the two anterior spots of the submarginal series are yellow, in 
D. momea they are white ; in the latter species there are three discal white 
spots, in D, datames only one ; and in the hindwing there is no discal series of 
