LYcmNOPsmm. 
243 
CASTALIUS AIR A V ATI. 
Plate 631, figs. 1, $, la, 9 j lb, $ , lc, $ . 
Castalius airavati , Doherty, Journ. As. Soc. Bengal, 1886, p. 261. de Niceville, Butt, of India, iii. 
p. 199, Frontispiece, fig. 133, $ (1890). Bingham, Fauna of Brit. India, Butt. ii. p. 427 
(wood-cut) (1907). 
Imago. —Male. Allied to C. ethion , Doubleday and Hewitson. Upperside, both 
wings light shining bine, the outer borders broadly, and the costa of the wing narrowly 
black ; a white band crosses both wings which has its upper part wide in the forewing, 
centering between the third medial and lower discoidal nervules, thence to the hind 
margin it is slender and almost obsolescent; on the hindwing it is narrow and angular. 
Underside, both wings with the ground ochreous-white (it is white in C. ethion), pure 
white on the lower part of the forewing. It differs from C. ethion below in the 
increased size of all the black markings. The transverse discal band across the 
hindwing, though irregular, is continuous, its two parts very close together, the upper 
one is widely united near the costa with the outer of the two oblique basal stripes ; the 
latter are united in both wings, enclosing a narrow white band. The two lines of 
sub-marginal spots are less equal and regular than in C. ethion , the inner one being- 
very large and forming an almost continuous and very heavy lunular line; the anal 
and sub-anal black spots are edged with silvery blue. Tail shorter than in C. manluena, 
Felder (Doherty). 
Female. Upperside entirely lacking the blue gloss of the male ; the discal white 
band rather narrower. Forewing with a somewhat rectangular, detached black spot, on 
the outer side of the white medial band. Flindwing with the white band prominently 
narrowed anteriorly by the encroachment on it of the inner portion of the black area 
on the termen. Underside ground colour and markings similar to that of its own 
male. Antennae, head and body as in C. ethion (Bingham). 
Expanse of wings, ^ ? 1 T 2 7 inches. 
Habitat. —Nicobar Islands. 
We have not seen this species; the types are in the Indian Museum, Calcutta; 
the figures are copied from de Nice'ville’s and Bingham’s figures. 
CASTALIUS ROXUS. 
Plate 631, figs. 2, $, 2a, ? , 2b, $ , 
Polyommatus roxus, Godart, Enc. Meth. ix. p. 659 (1823). 
Lyceena roxus , Horsfiekl, Cat. Lep. E.I.C. p. 70, pi. 2, fig. 4, 4a, ?, 4b to 4f (structure of irna^o) 
(1828). 
Cupido roxus, Druce, Proc. Zool. Soc. 1873, p. 348. 
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