BIZONE. — CTANA. 37 



posterior margin ; posterior half of abdomen cream-coloured, tinted with pink. Wings below 

 rose-coloured, witb white fringes j primaries with white internal border : body below white, 

 tibiae and tarsi greyish above. Expanse of wings 1 inch. 

 S , Darjiling (Lidderdale) ; ? , Silhet, Moulmein, &c. 



This species and its allies may eventually have to be generically separated from the 

 following, which must be regarded as the type of Bizone — since, in spite of their similarity of 

 coloration, the costal fold on the upper surface of their primaries is only represented by a 

 thickened mass of projecting scales over the end of the cell and the costal margin above it; 

 on the under surface of these wings also the corresponding pouch is abbreviated and much less 

 prominent (this peculiarity exists in the whole of the species of the B. puella group) : a third 

 group, of which B. hamata is typical, has an abbreviated fringed costal fold or pouch on the 

 upper surface. 



Bizone perornata. (Plate LXXXVI. fig. 8.) 

 Bizone perornata, Walker, Cat. Lep. Het. ii. p. 548. n. 1 (1854). 



<$ . Wings above snow-white, primaries crossed by three equidistant scarlet bands, the 

 commencement of a fourth represented by a subapical internally-dentated streak ; extremity 

 of costal fold also scarlet ; the inner edge of the second band, the outer edge of the third, 

 and a large spot at the end of the cell black : secondaries with a diffused pink external border 

 not extending to apex : thorax white, the back of the collar and tegulae and a large spot on 

 the middle of the thorax scarlet ; abdomen rose-red, with white anal fringe. Under surface 

 of wings snow-white, the primaries with a broad fleshy bilobed vermiUon costal pouch, the 

 costa streaked with vermilion ; body below sordid white, the coxae and femora reddish in front, 

 the tibiae streaked in front with black ; the tarsi of the first and second pairs of legs black 

 above, those of the third pair banded with greyish. Expanse of wings 1 inch 9 lines . 



Silhet. 



CYANA, Walk. 

 Cyana detrita. (Plate LXXXVI. fig. 9.) 

 Cyana detrita, Walker, Cat. Lep. Het. ii. p. 529. n. 1 (1854). 



Snow-white : primaries crossed by five irregular interrupted pale sandy-brown bands, 

 which become blackish on the costal border ; a darker brown, acutely angulated, stripe close 

 to the base ; all the bands excepting the submarginal one are more or less diffused ; three 

 blackish spots forming a triangle within the end of the cell : palpi brown ; antennae brown, 

 annulated with white ; thorax spotted with brown. Primaries below pale smoky brown, with 

 whitish internal border and creamy white outer border; secondaries snow-white : body below 

 white, tibiae and tarsi broadly banded above with brown. Expanse of wings 1 inch 6 lines. 



Silhet. 



