190 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Sterna trudeauii Audubon. 



Sterna irudeattii, Audub. Orn. Biogr. V. p. 125 (1839); Des Murs in 

 Gay's Hist. Chil. Zool. I. p. 484 (1847); Phil. & Landb. Cat. Av. 

 Chil. p. 49 (1868: Santiago: Colchagua) ; Durnf. Ibis, 1876, p. 165 

 (Monte Video, May), 1877, p. 200 (Flores Isl. mouth of La Plata, 

 March; Punta Lara); Burm. An. Mus. Nac. Buenos Aires, III. part 

 X. p. 248 (1888: Coast of Northern Patagonia); Scl. & Huds. 

 Argent. Orn. II. p. 195 (1889: Punta Lara); Holland, Ibis, 1890, p. 

 428 (Buenos Ayres breeds); Saunders, P. Z. S. 1891, p. 373 (Ar- 

 gentina); James, New List Chil. B. p. 12 (1892); Holland, Ibis, 

 1892, p. 212, Estancia Espartilla, common, breeds in Nov.); Saun- 

 ders, Cat. Bds. Brit. Mus. XXV. p. 130 (1896); Sharpe, Hand-List 

 Bds. I. p. 137 (1899); Oates, Cat. Bds. Eggs, Brit. Mus. I, p. 196 

 (1901). 



Phaetitsa sellovii, Licht. Nomencl. Av. Mus. Berol. p. 98 (1854: Mal- 

 donado). 



Sterna frobeenii, Phil. & Landb. Weigm. Arch. 1863, p. 125 (Arica Bay, 

 Sept.); iid. Cat. Av. Chil. p. 49 (1868). 



Fig. 1 14. 



Sterna trudeauii. Adult male. About ^^ natural size. From material in American Museum. 



General description. 



Size. — Adult (breeding). Total length, about 15 inches. 



Wing, 10.5 inches. 



Tail, 5.8 inches. 



Tail (depth of fork), 2.8 inches. 



