32O PATAGONIAN EXPEDITIONS : ZOOLOGY 



the frontal region, a more or less defined white eyebrow stripe, the sides of 

 the face are white, with little or no dusky markings and the entire lower 

 parts are white. Some individuals show faint dusky lines or dots on the 

 breast. 



The sexes are similar in color, both breeding and winter dress. 



Young birds of the year differ from adults in winter, in not being so uni- 

 form in color above. The dusky markings on back and head are better 

 defined, the streaks on the crown often reaching across middle of the white 

 frontal band to the bill. The sides of the breast are shaded with buffy 

 and the sides of the neck are distinctly spotted with dusky. 



Geographical Range. Nearly cosmopolitan. Breeds in the Arctic re- 

 gions, and visits the southern continents and many of the islands of the 

 Atlantic and Pacific Oceans in winter; extreme South America, Africa 

 and Asia, but does not appear to have been recorded from Australia or 

 New Zealand. 



The Sanderling Sandpiper was not noticed by the naturalists of the 

 Princeton Expeditions, but it has been recorded from many points in that 

 region. The descriptions are founded on the large series of these birds 

 in the British Museum of Natural History and on some twenty-five indi- 

 viduals in the Princeton Museum. 



Genus HETEROPYGIA Coues. 



* Type. 



Heteropygia, Coues, Proc. Acad. Nat. Sci. Philad. 1861, p. 

 191 ; Sharpe, Cat. Bds. Brit. Mus. XXIV. p. 561 

 (1896); id., Hand-list Bds. I. p. 163 (1899). . . H. fuscicollis. 



Delopygia (nom. altern.), Coues, op. cit. 1861, p. 190, 



note H. fuscicollis. 



Limnocinclus, Gould, Handb. B. Austr. II. p. 254 (1865). H. acmninata. 



Geographical Range. North and South America. Eastern Siberia to 

 China and Australia. Accidental in Europe. 



