PICARIAN BIRDS AND PARROTS OF CEYLON. 249 
II.—Wing 5 inches or under and comparatively shorter, 
primaries only one-third longer than secondaries. 
(a) Bill fairly slender, not compressed ; wing about 
4°5; adult plumage unbarred ashy-gray; im- 
‘mature birds suffused with rufous on throat and 
chest, and with barred upper plumage. 
Cacomantis passerinus (Indian Plaintive Cuckoo). 
(6) Bill stouter and compressed ; wing about 5 ; no 
distinct immature dress ; plumage always barred ; 
no rufous on throat and chest. 
Penthoceryx Sonnerati (Banded Bay Cuckoo). 
III.—Sexes dissimilar ; upper plumage metallic green or 
bronze ; wing about 4°4. 
Chrysococcyx maculatus (Emerald Cuckoo). 
IV.—Plumage black; appearance mimics that of the 
Drongo ; wing about 5. 
Surniculus lugubris (The Drongo Cuckoo). 
B.—A distinct crest; tarsus feathered only at the base. 
Genus Coccystes. 
(a) Wing under 6 ; upper parts black. 
C. jacobinus (Pied Crested Cuckoo). 
(b) Wing over 6, and mainly chestnut coloured ; a 
white collar. 
C. coromandus (Red-winged Crested Cuckoo). 
@ 
CucuLus canorus (Blanford, Vol. EO 205): 
Legge, p. 221). 
The Cuckoo. 
Description.—Adult : Upper plumage ashy-gray, paler, and 
tinged with bluish on the rump and upper tail coverts ; wing 
quills brown, the inner webs with deep notches of white ; 
tail feathers blackish-brown with white tips, the margin of the 
inner webs spotted with white, and a few white markings along 
the shafts. Throat and fore-neck pale ashy-gray, blending 
on the sides of the neck into the darker hue of the upper 
