CEYLON WATER BIRDS. 297 
Rough Key to Ceylon Species. 
A.—Fourteen tail feathers ; wing about 15 ; feet paie yellow. 
Sula leucogaster (the Booby). 
B.—Sixteen tail feathers ; wing about 16°5 ; feet slaty. 
S. cyanops (the Masked Booby). 
SULA LEUCOGASTER (Blanford, Vol. IV., p. 346). 
SULA LEUCOGASTRA (Legge, p. 1177). 
The Booby, or Brown Gannet. 
Description.—Head, neck, all upper parts, and upper breast 
chocolate-brown, with a deeper bluish tinge on the wing quills 
and tail feathers ; the lower breast and abdomen with the 
lower tail coverts white ; wing lining brown with some white. 
Immature birds are rather lighter than adults on the upper 
plumage, and the lower parts are pale brown with whitish tips 
to the feathers. 
Bill creamy white ; iris white or very pale ; the pouch and 
naked skin of the face is pale, with a blue, green, or yellow tinge. 
Length 28 to 32; wing 15; tail 8; tarsus 1°8; bill from 
gape 4°5. 
Distribution.—A straggler to Ceylon during the north-east 
monsoon. It has been recorded on several occasions from 
Arippu, Colombo, Kalutara, and Galle. Occasionally met 
with on the coasts of India and Burma, its range extending 
throughout tropical seas all round the world. 
SuLa cyanops (Blanford, Vol. IV., p. 347; Legge, p. 1180). 
The Masked Booby. 
Description.—Plumage white, except the wing quills, greater 
coverts, and tail feathers, which are blackish-brown. 
Immature birds are brown throughout, with a few paler 
feathers on the breast and abdomen; the wing lining is 
mostly white with some brown. 
Bill yellow or greenish-yellow ; iris yellow, reddish, or 
greenish-yellow ; pouch and naked skin of face dark slate- 
colour ; legs and feet slate-gray, the webs darker. 
Length 32; wing 16°5; tail 7°25; tarsus 2°2; bill from 
gape 5. 
