422 L. de Nicevillc & Dr. L. Martin — Butterflies of Stimcitra. [No. 3, 
Other probable synonyms are E. gopia , Moore, E. godartii. Gray, 
described from Sumatra, and E. monina , Fabricius. During the time 
Mr. W. Davison of the Singapore Museum was alive he devoted 
much time and pains to no purpose in trying to separate into dis¬ 
tinct species the many forms recorded by Mr. Distant from the Malay 
Peninsula, and to this end captured many hundreds of specimens 
of both sexes, numbers of which he sent to me. In the forests of 
Sumatra this protean species is equally common, and Dr. Martin has 
obtained both sexes in large numbers. He and I have quite failed to 
split them up into separate species. Dr. Staudinger appears also to 
have succeeded no better. Both sexes are variable, but it is in the 
female that the variations are the greater and more puzzling. It is 
quite easy to assign names in accordance with described species to the 
more conspicuous varieties, but when one comes to arrange large series 
of specimens one finds how impossible it is to divide them into separate 
species. The only solution of the difficulty in splitting up this species 
appears to lie in extensive breeding from the egg. Even supposing 
the male primary sexual organs should on microscopical examination 
disclose specific differences, the difficulty will only be half got over, as 
the question of pairing the females with the males found to represent 
distinct species will be quite hopeless till both are bred. I have adopt¬ 
ed the oldest name for the group. Dr. 0. Staudinger has taken the next 
oldest name, which is the “ Papilio ” monina , also of Fabricius. E . cocytus 
is the commonest species of Euthalia occurring in our area, and is found 
everywhere except on the Central Plateau. The males are very easily 
damaged, and seldom found in collections in an absolutely perfect state. 
The male is doubtless mimicked on the wing by the males of Stibockiona 
tiannegieteri , Fruhstorfer. 
209. Euthalia ( Felderia ) asoka, Felder. 
Snellen. This species was originally described from a female 
from “Malacca interior” and Borneo; Distant records it from Penang, 
Province Wellesley, and Malacca. He figures both sexes, and associates 
with the very distinct female a male with the apex of the forewing 
rather more produced than in the males of the other species of the 
group he retains as distinct species, and with the underside of both 
wings unusually dark, with a broad outer pale margin to the fore wing. 
At the earnest request of Dr. Martin I retain this species as distinct 
from E. cocytus , Fabricius, but it is against my better judgment 
to do so. The female is typically very distinct, as it has on the 
upperside of the forewing a prominent band of seven sullied white 
spots, the anteriormost sometimes divided into two spots, but joined 
