BIZONE.—CYANA. 37 
posterior margin; posterior half of abdomen cream-coloured, tinted with pink. Wings below 
rose-coloured, with white fringes ; primaries with white internal border: body below white, 
tibiz and tarsi greyish above. Expanse of wings 1 inch. 
6, Darjiling (Lidderdale); 2, 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). 
g. 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 pmk external border 
not extending to apex: thorax white, the back of the collar and tegule 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 vermilion costal pouch, the 
costa streaked with vermilion ; body below sordid white, the coxze and femora reddish in front, 
the tibize 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; antennz 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, tibize and tarsi broadly banded above with brown. Expanse of wings 1 inch 6 lines. 
Silhet. 
