1895.] L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. 403 



137. Cynthia erotoides, de Niceville, n. sp. 



C. deione, Distant (nee Erichson), Rhop. 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 32 ; 9 , 3*7 to 4-0 inches. 



Description : Male. Upperside, both wings differ from G. erota, 

 Fabricius, from the 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 Lucon 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 iu being almost entirely ochreous, with a very small 

 instead of a large black centre. 0. 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 Bekantschan. 



138. Cynthia battaka, Martin. 

 C. battiha, Martin, Nat. Tijd. voor Necler.-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 l'ed, and the subapical spot 

 in the upper discoidal interspace of the forewing is always silvery- 

 white, while in E. 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. battaka alone 

 J. ii. 51 



