AVES LARID^:. 1 77 



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). 



Sterna anglica, Mont. Orn. Diet. Suppl. fig. (1813; Sussex): Burm. 



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



X. p. 248 (1888: Coast of northern FIG. 109. 



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



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



(Estancia Espartilla, rare, occasional 



throughout the year). 

 Viralva aranea, Darwin, Voy. "Beagle," 



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

 Gelochelidon anglica, Saunders, Cat. Bds. Gtiochdidon anglica. Profile of 



_ . ,, ,,.,,, T , ^ s-. TT i head. Adult breeding. From ma- 



Brit. MUS. XXV. p. 25 (l8 9 6); Hoi- terlal in Prince ton University Mu- 

 land,. Ibis, 1897, P- 169 (Estancia Sta. seu m. About ^ natural size. 

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

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



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. 



