LYC2EN0PSINJE. 
249 
Castalius niasana, nov. Male. Uppersicle pale greyish-blue ; a white transverse band from vein 6 of 
forewing, expands outwards above vein 3, is uniform on that wing, expands outwards in its 
middle on the hind wing; forewing with a black costal line ; both wings with a thin black more 
or less macular band, white terminal line, black cilia; wings rather transparent, nearly all the 
markings of the underside showing through. Underside as in C. ethion, but there is a thick 
linear spot at the end of the cell of both wings. Expanse 1 T 1 ^ inches. Habitat, Nias. Type in 
the B. M. from coll. G-odman, and three other examples from the Crowley Bequest. 
Genus TARUGUS. 
Tarucus , Moore, Lep. Ceylon, i. p. 81 (1881). de Niceville, Butt, of India, iii. p. 186 (1890). 
Bingham, Fauna of Brit. India, Butt. ii. p. 417 (1907). 
Eyes naked ; closely allied to Castalius. Forewing , cell a little longer, vein 9 
from beyond middle of 7, costa more slightly arched. Hindwing with vein 7 from 
apical half of sub-costal. Antennse half the length of costa of forewing, club fusiform ; 
though closely allied to Castalius in venation and general structure, it is much more 
widely distributed, occurring in Europe, Africa, Western Asia, Asia Minor, Persia, 
India and Ceylon, but apparently not in the Andamans, Nicobars, or the Malay 
Peninsula; in so far as our researches go, it is only represented by two species in the 
Indian region, Theophrastus , Fabricius, and Venosus, Moore; the so-called Tarucus 
pimiics belongs to another group of the family, having hairy eyes and other material 
differences ; in colour and pattern Tarucus differs from Castalius , the upperside of the 
wings being always more or less of a uniform greyish-purple colour above, with black 
spots on a white ground beneath, and therefore for the sake of convenience we think 
it advisable to keep it distinct. 
Type, T. theophrastus , Fabricius. 
TARUCUS THEOPHRASTUS. 
Plate 634, figs. 1, $, la, $, lb, $ (Wet-season Brood), 1c, $, Id, le, 9 (Dry-season Brood), 
If, $, lg, $ , lb, $ (Extreme Dry-season Brood). 
Hesperia theophrastus, Fabricius, Ent. Syst. iii. p. 281 (1793). 
Polyommatus theophrastus, Godart, Enc. Meth. ix. p. 658 (1823). 
Lycsena theophrastus, Lucas, Expl. Alg. Zool. iii. p. 362. Lep. pi. i. fig. 6, 6a, $, 6b, antenna (1849). 
Horsfield, Cat. Lep. E.I.C. p. 73 (1828). Horsfield and Moore, Cat. Lep. Mus. E.I.C. i. p. 25 
(1857). Moore, Proc. Zool. Soc. 1865, p. 772. Lang, Butt, of Europe, p. 140 (1884). 
Lampides theophrastus, Butler, Cat. Fabr. Lep. B. M. p. 164 (1869). 
Tarucus theophrastus, Moore, Lep. Ceylon, i. p. 81, pi. 36, fig. 3 (1881). Butler, Proc. Zool. Soc. 1883, 
p. 148, and 1884, p. 484. Swinhoe, id. 1885, p. 134, and 1886, p. 438. Doherty, Journ. As. 
Soc. Bengal, 1886, pp. 122 and 132. de Niceville, Butt, of India, iii. p. 187 (1890). Davidson, 
Bell and Aitken, Journ. Bo. Nat. Hist. Soc. 1890, p. 353. Watson, id. 1891, p. 46. Betham, 
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