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OLIVE- BACKED SUNBIRD. 
Cinnyris chloronotus , Swains. 
PLATE XVI. 
Body above, olive-yellow ; beneath, cinereous grey ; head, 
throat, and breast, glossy blue-green ; side-feathers of the 
breast, straw-yellow. 
Le Soui'-manga a tete bleue, VleiUol, Ois. d'Or. ii. p. 31, pi. 7. 
— Certhia eyanocepliala, Auctorum. 
i 
The great importance of affixing to tlie species of 
so intricate a group as this is, such specific names 
only as will assist in discriminating them, is one of 
the reasons why we do not adopt that of cyanoce- 
phala in the present case ; another is, in the doubts 
we have as to the propriety of considering the Soit'i 
manga a the blew of M. Vieillot, and the S. M. 
vert et gris of the same author, as one species. 
Added to this, there are nearly twenty Sunbirds to 
which the name of cyanocephalus will apply ; while 
this is the only one we at present know of, whose 
upper plumage, in an adult state, is green. 
The size is about equal to that of the red-collared 
species already described. The whole of the head, 
neck above, and the throat, as far as the breast, is 
of a dark glossy blue-green ; this colour terminates 
before it reaches the interscapulars, which, with 
