386 Mr. H. J. Elwes’ catalogue of the 
This pretty species is not uncommon in the valleys of 
the Rungit and other streams at 1—3000 ft. from April 
to October. 
268. Castalius roxus. 
Polyommatus roxus, Godt., Ene. Meth., ix., p. 659 
(18238). 
Common up to 4 or 5000 ft. from April to October. 
2 Castalius elna. 
Lycena elna, Hew., Ex. Butt., v., Lyc., t. i., 8 (1876). 
Mr. de Nicéville notes this as occurring in Sikkim, 
and I have three specimens which agree with what he 
calls elna from the Andamans, but do not see how to 
distinguish them from C. roxus. 
269. Castalia rosimon. 
Papilio rosimon, Fabr., Syst. Ent., p. 523 (1775). 
An insect of the plains rather than the hills, but it 
occurs in the Terai, and occasionally up to 3000 ft. 
almost all through the year. 
270. Nacaduba ardates. 
Lycena ardates, Moore, P. Z.8., 1874, p. 574 (t. 67, 
fig. 1 not recognisable). 
A common species in wet sandy places in river-beds, 
where they fly round and round close to the ground in 
little swarms like flies, constantly settling on the sand, 
and easy to take in quantity. I found these flocks 
composed of males alone, and never took a female 
myself; they are rare in all the species of this genus. 
271. Nacaduba macropthalma. 
Lycena macropthalma, Feld., Zool. Bot. Ges., xii., 
p. 483 (1862); Reise Nov., i, p. 273, t. 34, 
fig. 35. 
Fairly common at 1 to 3000 ft. from April to 
November. 
