AVES CHARADRIID/E 329 



head, and the region of the ear coverts. The pectoral region is buffy in 

 tone much as in H. bairdi. 



Wintey adults are very similar in appearance to H. bairdi at that sea- 

 son, but can be generally discriminated, by their slightly smaller size. 



Heteropygia fuscicollis. Showing the pattern of the tail feathers and the upper tail coverts. 

 P. U. O. C. 7799. About two thirds natural size. 



white upper tail coverts and the markings on the sides and flanks. At 

 this season adults are more uniformly ashy grey than are the adults of H. 

 bairdi. 



Young birds of the year are similar to summer adults in their general 

 rusty tone, but have very broad whitish edging to the feathers of the back 

 and to the scapulars. The pectoral region is browner and the streaking 

 obscured by the terminal unworn edges of the feathers, which are long and 

 filamentous. The sides of the body are washed with pale brown, 

 through which the markings characterizing the species are obvious. 



"Male. La Plata, Buenos Aires, Arg. Rep., Nov. 3, 1882. 



" Iris brown. 



"Found abundantly in flocks on the edges of the lagoons, sometimes 

 intermingling with flocks of T. dorsalis.'^ (E. W. White, P. Z. S. 1883, 

 p. 42.) 



733, male, Falkland Islands. 



"Eyes brown; stomach had sand, etc." 



(Sclater & Salvin, on Birds Antarctic America, Voy. H. M. S. "Chall." 

 — No. IX. p. 438, 1878.) 



"Female in winter plumage: Peckett Harbour, January 4, 1879." 

 (Sharpe, P. Z. S. 1881. p. 16.) 



Geographical Range. — Eastern North America, breeding in the high 

 latitudes. Migrating south by the Eastern Coast of Central America, 



