1895.] L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. 403 
137. Cynthia erototdes, de Niceville, n. sp. 
C. deione, Distant (nec Erichson), Rliop. Malay., p. 184, n. 1 , pi. x, figs. 1 , 
male ; 2, female (1883). 
Snellen as arsinoe. Hagen as arsinoe. Staudinger as arsinoe . 
Kirby as arsinoe . Distant as deione. 
Habitat : Malay Peninsula, N.-E. Sumatra, Borneo. 
Expanse : c?, 2*9 to 3'2 ; 9, 3*7 to 4*0 inches. 
Description: Male. Upperside, both win as differ from G . erota , 
Fabricius, from tlie Eastern Himalayas, Bhutan, Assam, Burma, 
and Java in their darker ground-colour. Forewing differs in the apex 
being widely and the outer margin decreasingly infuscated. Otherwise 
as in that species. Female. Upperside, hindwing differs only in having 
the inner of the two submarginal fuscous lines straighter—less lunula- 
ted—and continuous. Otherwise as in that species. 
Cramer described G . arsinoe from Amboina and the west coast of 
Sumatra, but apparently figured it (a male) from the former locality, 
my specimens from Saparua in the Moluccas and from New Guinea 
agreeing fairly well with Cramer’s figure. G. dejone, Erichson, was 
described from Lu .9011 in the Philippines, the female being figured. 
In the male of this species the apex of the forewing on the upper- 
side is not infuscated, and in the female the ocelli of the hindwing on 
the upperside differ in being almost entirely oclireous, with a very small 
instead of a large black centre. G. cantori, Distant, described from a 
unique specimen from Province Wellesley, is probably a “ sport.” 
The males of G. erotoides are common everywhere in Sumatra, and are 
found all the year round on forest roads, where they are fond of moist 
spots, to which they will always return even after an attempt is made 
to catch them. The females are as rare as the males are common, and 
are only found in the forest. The males have a strong short flight, 
somewhat like that of a Gharaxes , whereas the females fly more slowly 
and sail more. The species is found only as high as Bekanlsclian. 
138. Cynthia battaka, Martin. 
C. batt ilca, Martin, Nat. Tijd. voor Neder.-Indie, vol. liii, p. 338, n. 3 (1893). 
This species may typically be known from G. erotoides , de Niceville, 
by its smaller size, darker ground-colour of the upperside, the apex of 
the forewing especially being much more infuscated, the basal area 
of both wings on the underside is of a deeper red, and the subapical spot 
in the upper discoidal interspace of the forewing is always silvery- 
white, while in F. erotoides it is either totally wanting, or, if present, 
is small and fuscous; the tail to the hindwing is also shorter. From 
Bekantschan to the higher hills and the Central Plateau G. battalia alone 
J. ii. 51 
