324 PATAGONIAN EXPEDITIONS I ZOOLOGY 



uary, and even then a few may usually be found. They are almost always 

 in company with the preceding species (Heteropygia fiiscicollis], often 

 forming flocks of several hundred individuals. Where they go in the sum- 

 mer I do not know, but they were abundant at Carhue and neighboring 

 places in March and April." (Barrows, Auk, I. p. 314, October, 1884.) 



HETEROPYGIA BAIRDI (Coues). 



Actodromus bairdii, Coues, Pr. Nat. Sci. Phil. 1861, p. 194. 



Tringa dorsalis, Burm. Reise La Plata, II. p. 503 (1861). 



Tringa bairdi, Scl. P. Z. S. 1867, p. 332 (Santiago); id. & Salv. P. Z. S. 

 1868, p. 144 (Conchitas), 1873, p. 455 (Buenos Aires); Scl. P. Z. S. 

 1886, p. 404 (Tarapaca); Tacz. Orn. Perou, III. p. 359 (1886); See- 

 bohm, Geogr. Distr. Charadr. p. 444 (1888); Scl. & Huds. Argent. 

 Orn. II. p. 184 (1889); James, New List Chil. B. p. 12 (1892) ; Aplin, 

 Ibis, 1894, p. 209 (Uruguay, April). 



Heteropygia bairdi, Sharpe, Cat. B. Brit. Mus. XXIV. p. 570 (1896; Tara- 

 paca, Jan., Feb.: Santiago: Talcahuano, Sept.: Pampas Argentinas); 

 id., Hand-list B. I. p. 164 (1899). 



FIG. 1 66. 



Heteropygia bairdi. Head of adult in winter. P. U. O. C. 7797. One half natural size. 



GENERAL DESCRIPTION. 



Size. Male adult. P. U. O. C. 7796, near Rio Coy, Patagonia, 30 

 September, 1896. J. B. Hatcher.) Total length, 7.4 inches. 



Wing, 4.85 inches. 



Culmen, i.o inch. 



Tail, 2.0 inches. 



Tarsus, 0.95 inch. 



The sexes do not vary appreciably in size, but there is a considerable 

 range in size individually, denoted by a minimum length of 6.9 inches and 

 a maximum length of 7.7 inches. The wing varies from 4.6 inches to 

 4.9 inches. 



