190 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



STERNA TRUDEAUII Audubon. 



Sterna trudeauii, 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); Gates, Cat. Bds. Eggs, Brit. Mus. I, p. 196 

 (1901). 



Phaetusa 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. 



