1895.] L. de Niceville & Dr. L. Martin — Butterflies of Sumatra. 399 
also and Sumatra. The larva feeds on Ricinus communis, Linn., the 
castor-oil plant. Occurs everywhere in the plains and all the year 
round, mostly near the houses of Indian (Tamil) coolies, who are very 
fond of cultivating the castor-oil plant. Its flight is perhaps lower 
and weaker than that of E. ariadne , Liunseus. Dr. Hagen records 
E. taprobana, Westwood, from Sumatra, a species confined to South 
India and Ceylon as far as our experience goes. It is a very noticeable 
fact that everywhere two quite distinct species of Ergolis occur together. 
124. Eurytela horsfieldii, Boisduval. 
Hagen. Grose Smith. 
125. Eurytela castelnaui, Felder. 
Snellen. Hagen. Grose Smith. Both the Sumatran species of this 
genus occur only in forests, and are somewhat rare insects, the female 
being the rarer sex of the two. E. horsfieldii , Boisduval, occurs more 
in the plains, from Bindjei to Namoe Oekor ; E. castelnaui at higher 
elevations, from Namoe Oekor to Soengei Batoe. The females are 
splendid mimics of the two preceding species of Ergolis, E. castelnaui 
mimicking E. isdeus, Wallace, and E. horsfieldii mimicking E. ariadne, 
Linnaeus. Even in the way of flying they closely resemble the flight 
of species of Ergolis. Dr. Martin obtained his first female of E. castel- 
natii while catching E. isdeus on the same spot in a forest south of 
hamoe Oekor. The males always settle with folded wings for greater 
protection, and have some predilection for the sandy banks of small 
streams running through the forest. 
126. Euripus halitherses, Doubleday and Hewitson. 
Hagen as halitherses and euploeoides. Staudinger. The male differs 
from typical E. halitherses in having the marginal dots on both sides 
of the forewing restricted more to the anal angle. The female is tri- 
morphic, in one form the ground-colour is brown as in typical E. euploe¬ 
oides, F elder; in the second form it is indigo-blue; in the third form 
it is blue without white patches on both wings and mimics Euplcea 
linnaei, Moore. The first two forms seem to be mimics of Euplcea 
diocletianus, Fabricius. As usual, the amount of white coloration on 
the wings in the female is very variable, and on that character no 
species should be based. One of these inconstant forms has recently 
been described by Mr. Distant as E. borneensis, and seems to be inter¬ 
mediate between E. euploeoides and E. pfeiflerse, both of Felder, from the 
Malay Peninsula. This species was, before the forests of Deli and 
Langkat fell victims to the triumphal march of the tobacco cultivation, 
