464 L. de Nic^ville & Dr. L. Martin — Butterflies of Sumatra. [No. 3, 
After all, tliis species turns out to be a true Iraota , though it 
is somewhat aberrant, as both sexes have two tails (in I. rochana the 
male has two [Dr. Martin says three] and the female three tails; in 
I. timoleon, Stoll, and allies the male has one and the female two tails), 
and the shape of the wing differs also somewhat from typical Iraotas 
in both sexes. The neuration, however, is quite normal. In Sumatra 
both the species of Iraota are rare, the males even more so than the 
females. Dr. Martin took the first male of J. rocliana , Horsfield, a very 
large specimen, measuring 1*7 inches, at Namoe Oekor in August, 1892, 
and the first male of I. nila near Bekantschan in October, 1893. W e 
have other specimens taken at Selesseh in July, and in the Battak 
mountains in September. 
385. Surendra amisena, Hewitson. 
Grose Smith. Hagen. 
386. Surendra florimel, Doherty. 
Originally described from Lower Burma. 
387. # Surendra vivarna, Horsfield. 
Hagen. Originally described from Java, from whence I have a 
good series of both sexes. S . amisena , Hewitson, and S. florimel , 
Doherty, both occur at low elevations in the forests of the plains, the 
former is very common near Selesseh, the latter much rarer. The males 
of the two species must be differentiated by the markings of the under¬ 
side of the wings. In habits they resemble those of the following genus. 
388. Arrhopala centaurus, Fabricius. 
Butler. Distant. Occurs in the sultanate of Indragiri. 
389. Arrhopala agnis, Felder. 
Grose Smith. Hagen. The shade of coloration of the upper- 
side of the male is more variable in this species than in any other 
known to me ; in some specimens it is almost pale blue, and there is 
nearly every gradation to be met with till deep purple is reached complet¬ 
ing the series. It is a common species, and is found in Burma, the 
Malay Peninsula, and Nias; in Sumatra it occurs at Selesseh and in the 
Battak mountains. 
390. Arrhopala ace, de Niceville. 
A. ace , de Niceville, Journ. Bomb. Nat. Hist. Soc., vol. vii, p. 329, n. 6, pi. H, 
fig. 13, male (1892). 
Originally described from Perak in the Malay Peninsula. I possess 
