66 MR. a. T. BETHUNE-BAKER : A REVISION OF THE 



Arhopala arzenius Felder. 

 Arhopala arzenius Felder, Reise Novara, Lep. vol. ii. p. 236, tab. xxix. fig. 18 (1865). 



Hah. Luzon ; Batchian. 



Expanse, d 40, $ 41 mm. 



6 . Upperside : both wings deep purplish blue, bright in some lights but exceedingly 

 dull in others. Primaries with costa narrowly, outer margin widely, and apex very 

 widely black ; secondaries with costa broadly, and outer margin less broadly, black. 

 Tail short, not much more than a tooth. Underside : both wings ochreous brown, 

 with dark brown markings with pale outlines. Primaries with three small but increasing 

 cell-spots, below each of which is another ; transverse band of nearly uniform width, 

 rather wide, nearly straight, but with a very slight outward inclination, composed of 

 six spots, the first of which is so small and indistinct as to be nearly obsolete, the 

 sixth spot ends on the lower median nervule ; submarginal row distinct, composed of six 

 spots terminating on the submedian nervure ; submedian area very pale. Secondaries 

 with four basal spots inwardly oblique, followed by four larger spots also somewhat 

 inwardly oblique; cell closed by a subquadrate spot, below which is a small one 

 connecting it with the third spot in the second series of four ; transverse band 

 composed of seven spots, the second of which touches the quadrate spot — hind spot 

 shifted right outwards on to the outer edge of the second, fourth slightly outwards, 

 fifth smaller oval spot inwards, sixth outwards, seventh angular spot well inwards ; 

 submarginal row distinct ; a few metallic-blue scales near the anal angle. 



2 ■ Upperside : both wings paler violet-blue ; primaries with the costa broadly, 

 outer margins more broadly, apex yet more broadly dark fuscous ; cell closed by a 

 blackish dash ; secondaries with the costa very broadly, and the outer margins less 

 broadly, fuscous. Underside precisely as in the male, but the metallic-blue scales near 

 the anal angle, very few in the male, are absent in the female. 



From labuana this species may be recognised by its much smaller size and by 

 the broad borders of the primaries, while on the underside the transverse band of the 

 primaries is of uniform width, absolutely unbroken and nearly straight, and there is 

 scarcely a trace of the metallic-blue scaling at the anal angle of the secondaries. 



Arhopala vihara (Felder). (Plate II. fig. 1, s .) 



Amblypodia vihara Felder, Wien. eat. Monatsch. vol. iv. p. 395. n. 5 (1860) ; Kheil, Rhop. 



der Insel Mas, p. 33. n. 122 (1884). 

 Arhopala vihara Felder, Reise Novara, Lep. vol. ii. p. 228. n. 253, pi. xxix. fig. 7 (1865). 

 Narathura vihara Distant, Rhop. Malay, p. 270. n. 16, woodcut n. 80 (1885). 

 Arhopala vihara de Niceville, Butt. India, vol. iii. p. 241 (1890) ; Bethune-Baker and Druce, 



P. Z. S. Lond. 1896, p. 662. 



Hah. Malacca; Nias Island, Borneo (Labuan and Tameaug-Lajang), Sumatra, and 

 Upper Tenasserim \ 

 Expanse, d , 44 mm. 



