58 Lloyd's natural history. 



has more rounded wings than her mate. There is a large 

 blood-red spot at the anal angle of the hind-wings, which have 

 two moderately long tails of nearly equal length, which are 

 black, tipped with white. On the under side the green hue 

 predominates, and the whole is thickly powdered over with 

 gold-dust, giving it a very rich appearance. All the wings are 

 traversed near the middle by a broad black line, bordered out- 

 side with pale blue, and forming a W-shaped pattern on the 

 hind-wings. Beyond this, on the hind-wings, is a broad deep- 

 red, or ferruginous band, paler towards the hinder edge, and 

 sprinkled with blue atoms. Towards the hind-margins the 

 wings are darker than elsewhere. 



GENUS ARCAS. 

 Anas, Swainson, Zool. Illustr. Ins. ii. pi. 88 (1833). 



ARCAS IMPERL^LIS. 



{P/afe XLIIL Figs, i, 2.) 



Papilio imperlalis, Cramer, Pap. Exot. i. pi. 76, figs. E, F 



(1775)- 

 Papilio ve?uis, Fabricius, Spec. Ins. ii. p. 115, no. 507 (1781). 

 Polyoniniatits venus, Godart, Enc. Meth. ix. p. 623, no. 20 



(1823). 

 Areas imperialis, Swainson, /. c. (1833). 

 Thecla imperialis, Staudinger, Exot. Schmett. i. p. 2S4, pi. 97 



(18S8). 

 This species resembles Pseudolyccena inarsyas in having 

 two tails on the hind-wings, of which the innermost is much 

 longer than the other, but it differs from it in its much smaller 

 size (measuring scarcely an inch and a half across the fore- 

 wings), and the wings are much shorter, with the hind-margins 

 regularly curved. The upper surface is brilliant blue, with the 



