VIREO. 



391 



greyish-white under-parts. The bill is compressed on the apical 

 portion and sharply hooked at the tip o£ the upper mandible. 

 The wing is rounded, the third and fourth primaries longest, the 

 second shorter than the fifth, but much longer than the sixth. 

 The tail is square at the tip and rather more than five-eighths the 

 length of the wing, and the tarsus is only slightly longer than 

 the middle toe and claw. Coloration : male and female alike. 



Key to the Species. 



A. Crown of head ochreous-green like the back. V. calidris, p. 391. 



B. Crown of head slate-grey in contrast to the 



back. 

 h. Larger, wing more than 70 mm., tail more 



than 50 mm F". oZjyfflceMS, p. 392. " 



c. Smaller, wing less than 70 mm., tail less 



than 50 mm V. roraimw, ^. ^Q^. 



592. Vireo calidris. 



MOUSTACHED GeEENLET. 



Motacilla calidris Linn. Syst. Nat. i. p. 329, 1766 (Jamaica). 



Vireo calidris Gradow, Cat. B. Brit. Mus. viii. p. 298, 1883 ; Salvin, 

 Ibis, 1885, p. 204 (Bartica Grrove, Camaousa) ; Brabom-ne & Chubb, 

 B. S. Amer. i. p. 348, no. 3562, 1912 ; Beebe, Tropical Wild Life in 

 British G-uiana, p. 135, 1917 (Bartica). 



Adult male. General colour of the upper surface olive-green, 

 including the crown of the head, back, wings, and tail; inner 

 webs of flight-quills dark brown with whitish inner margins ; 

 a loral streak of isabelline-buff which broadens out over the eye 

 and extends along the sides of the crown ; a dark mark in front 

 and behind the eye ; sides of the face isabelline-bufE ; a dark 

 moustachial streak ; throat white -tinged with isabelline ; breast, 

 abdomen, and under tail-coverts yellowish white; sides of breast 

 and sides of body pale olive-green ; axillaries and under wing- 

 coverts white like the inner edges of the quills below, remainder 

 of the quill-lining dark brown ; lower aspect of tail ash-grey. 



Total length 141 mm., exposed culmen 14, wing 80, tail 52, 

 tarsus 18. 



The specimen from which the description is taken was collected 

 on the Ituribisi River in 1909. 



Adult female. Similar to the adult male. Wing 75 mm. 



Breeding-season. Unknown in British Guiana. 



