STERNA. 91 



The descriptions of the male and female were taken from 

 specimens in the British Museum. 



Breeding-season. Unknown in British Guiana. 



jS^est. Unrecorded in British Guiana. 



J^ggs. Undescrihed from British Guiana. 



Range in British Guiana. Lower Mazaruni River (JMcConnell 

 collection). 



Ed'tralimital Range. Ariiba and Bonaire Islands and Bahia (\\\ 

 South America), Xorth America, Europe, Africa, India, and 

 Ceylon. 



Habits. Unrecorded in British Guiana. 



56. Sterna melanorliyiiclia. 

 Black- BILLED Little TERy. 



Sterna melanorhyncha (Less.), Descr. Mamm. et Ois. p. 252, 1847 

 (C4uadeloiipe) ; Brabom-ne & Chubb, B. S. Amer. i. p. 33, no. 329, 

 1912. 



Sterna antiUariim Saunders, Cat. B. Brit. Mus. xxv. p. 122, 1S96. 



Immature. General colour of the upper surface pale ash-grey ; 

 lesser marginal upper wing-coverts dark brown ; primary-corerts 

 and primary -quills blackish with broad white edges to the inner 

 webs of the latter ; head grey with daik median lines to the 

 feathers, nape darker and inclining to black ; forehead, throat, 

 and entire under surface pearly white. Basal portion of bill 

 yellow, tip black ; tarsi and toes orange-yellow. 



Total length 200 mm., culmen 31, wing 105. tail 53, tarsus 15, 

 middle toe and claw 18. 



The bird described above was obtained on the Abary Biver. 



Adult male. Back, wings, and tail pale grey ; the two outer 

 primaries blackish edged with white on the inner webs ; lores, 

 crown of head, and nape black; forehead and entire tmder 

 surface white. " Bill yellow, tip biac-k ; tarsi and toes orange- 

 ycdlow."' 



Total length 235 mm., culmen 31, wing 171, lateral tail- 

 feathers 101, tarsus 11. 



Adult female. Similar to the adult male. ^Ving 1G7. 



The descriptions of the adult male and female were taken from 

 5j)ecimen3 in the Briti>]i Museum collected at Brownsville, Texas — 

 Salvin-Godman collection. 



