Lepidoptera of Sikkim. 387 
272. Nacaduba atrata. 
? Lycena atrata, Horsf., Cat. Lep. E.1.C., p. 78 
(1828), °. . 
IL. Kurava, Moore, Cat. Lep. H.I.C., p. 22 (1857). 
A rare species, which occurs in the low valleys with 
the last, from which it is distinguished by the additional 
markings on the inner part of the hind wing below, and 
by the lighter, more slaty-blue colour which resembles 
the tint of N. dana. I have seen no females from 
Sikkim, and am not certain whether it is the same as 
Horsfeld’s species, as the single specimen which I have 
from Padang, in Sumatra, is not fresh enough for an 
accurate comparison. I took a male in the Khasias, 
however, which agrees with Sikkim specimens, and have 
a female from there which agrees with it. Two females 
in Moller’s collection differ from the same sex of N. 
macropthalma in having a broader dark margin to the 
fore wing, the base of which is strongly overlaid with 
glossy blue. The hind wing is darker, and the marginal 
bands more prominent. 
273. Nacaduba bhutea. 
_ Nacaduba bhutea, de Nicé., J. A. 8. B., 1888, p. 72, 
tT ne. £8. og 4 
This species, though very close to ardates, may be 
distinguished without difficulty, if fresh specimens are 
compared. The best character is in the lower spots of 
the discal series on the fore wing below, which form a 
bar right across the wing in ardates, and in bhutea are 
less in number, and do not reach the hind margin. 
De Nicéville says truly that the band crossing the middle 
of the cell on the fore wing below does not extend below 
it in bhutea, and, though in ardates it usually does, yet I 
find. some specimens in which this bar is variable in 
length. 
Bhutea is not so common as ardates, and, like it, 
frequents wet sandy spots in the beds of rivers at 
1—3000 ft. I took it below Mongpo in June, and 
Moller gets it from April to October. 
