52 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. VIII. 
Smith, Rhop. Ex., vol. i., Delias I, figs. 7, 8, male (1889), from the Siamese 
frontier of Burma, and D. kuehni, Honrath, Berl. Ent. Zeitsch., vol. xxx, 
p. 295, pl. vi, fig. 2, male (1886), from Bangkai Island, near Celebes. 
Described from a single example in Dr. Martin’s collection. 
12. DELIAS DERCETO, n. sp., Pl. L, Fig. 4, @. 
Hasrrat: Battak Mountains, Sumatra. 
EXPANSE: @, 3:0; @, 2°7 to 3°4 inches. 
Descriprion: Mane. Uppersipn, both wings deep black. Forewing with 
two white spots at the end of the discoidal cell defining the disco-cellular 
nervules ; a submarginal series of seven oval whitish spots placed between the 
veins. Hindwing bearing a large, anteriorly white powdered with dusky, 
posteriorly pale primrose-yellow, area divided by the veins, occupying the outer 
end of the cell, this area is bounded outwardly by a broad black border, which 
at the anal angle dwindles away to nothing, UNDERSIDE, forewing with the 
ground-colour black, but with a large area from the inner margin extending on 
to the disc powdered with whitish ; the discoidal and submarginal spots as 
above, but pure white, larger, and much more prominent. Hindwing with the 
immediate base of the wing black; then a broad curved rich crimson area, 
commencing on the costal nervure and ending on the abdominal margin, 
crossed by the black veins, slightly sprinkled with black scales ; followed by a 
rather narrow highly irregular black band ; the outer half of the wing pale 
chrome-yellow, gradually darkening to a deeper chrome in the two posterior 
interspaces, the veins crossing this area black, from the first median to the 
second subcostal nervule gradually outwardly dilated and forming between those 
veins a broad black border. FEMALE differs from the male only in the wings 
being somewhat broader, forewing with the apex more rounded. 
Apparently nearest to D. ninus, Wallace*, from Mount Ophir, Malacca, 
Malay Peninsula, but unknown to me except by the original description and 
figure, from which it differs in its larger size, both wings much broader, the 
forewing on both sides less heavily marked, two discoidal and seven submar- 
ginal spots only, no basal bluish patches whatever, the hindwing with no 
crimson basal patch on the upperside ; on the underside the crimson patch and 
the black band following it are twice as broad, thus reducing the chrome-yellow 
area in the discoidal cell by half. It is even more closely allied to 
D. crithoé, Boisduval, from Java, as identified by me, but may at once be 
known by the crimson band on the hindwing below being twice as broad, and 
with its outer edge evenly curved, instead. of straight, and no discal white patch 
on the upperside of the forewing. 
Described from one male and two females in my collection. 
* Trans. Ent, Soc, Lond., third series, vol. iv, p, 347, n. 9, pl, vii, fig, 1, male 1867). 
