AVES 



LARID^. 



177 



Geographical Range. — Temperate Europe and Asia, Australia, North 

 and South America on Atlantic coast from Brazil to Long Island, New 

 York, and casually to Massachusetts. Atlantic and Pacific coasts of 

 Mexico and Central America in winter ; almost unknown on the Pacific 

 coast at other seasons. 



Gelochelidon anglica (Montagu) 



1813; Sussex): Burm. 



Fig. 109. 



Sterna anglica, Mont. Orn. Diet. Suppl. fig 



An. Mus. Nac. Buenos Aires, III. part 



X. p. 248 (1888: Coast of northern 



Patagonia); Holland, Ibis, 1890, p. 248 



(Buenos Ayres) ; id. Ibis, 1892, p. 212 



(Estancia Espartilla, rare, occasional 



throughout the year). 

 Viralva aranca, Darwin, Voy. "Beagle," 



Birds, p. 145 (1841 ; Bahia Blanca). 

 Gelochelidon anglica, Saunders, Cat. Bds. 



Brit. Mus. XXV. p. 25 (1896); Hol- 

 land, Ibis, 1897, p. 169 (Estancia Sta. 



Elena) ; Sharpe, Hand-List Bds. I. p. 



134 (1899) ; Oates, Cat. Bds. Eggs, Brit. Mus. I. p. 177 (1901 



Gelochelidon anglica. Profile of 

 head. Adult breeding. From ma- 

 terial in Princeton University Mu- 

 seum. About j4 natural size. 



General description. 



Size (adult). — Total length, 13.7 to 15.5 inches. 



Wing, 11.75 to 13 inches. 



Tail, lateral rectrices, 5.3 to 6.0 inches. 



Tail, depth of fork, 1.5 to 1.75 inches. 



Culmen, 1.4 to 2.0 inches. 



Tarsus, 1.35 to 1.45 inches. 



Color. — Adult male. (Breeding, No. 4217, P. U. O. C. Cobb's Island, 

 Virginia, 12 May, 1881, W. E. D. S.) 



Head : Forehead, crown and nuchal crest velvety black. This cap ex- 

 tends down on the sides of the face to the lower edge of the eye, where it 

 terminates abruptly. Forward of the eye the cap occupies rather more 

 than half of the loral region. 



