290 PATAGONIAN EXPEDITIONS : ZOOLOGY 



whole. Back of this, the black pectoral band is indicated, each black feather 

 tipped with ashy white. Rest of the lower parts as in summer adults. 

 The forehead is dull slate grey, which color extends to below the eyes on 

 the fore part of the face, fading, into grayish snuff brown. The white fore- 

 head band and the white eyebrow streak indicated. Tail like that of 

 adult in summer. 



FIG. 153. 



Zonibyx modestus. Head of young of the year. P. U. O. C. 7793. Female. Natural size. 



Young of the year. (Male, P. U. O. C. 7978, Arroyo Gio, Patagonia, 

 9 April, 1898, A. E. Colburn.) 



Much darker above than adults in winter and with conspicuous buffy 

 white margins to the feathers, especially on the shoulders and greater 

 coverts as well as on the back. 



Below, much like adults in winter, but the chest patch much more sandy 

 and the pectoral black band almost obsolete. The whole head more buffy, 

 especially on the forehead. The white forehead band not indicated, but 

 the eyebrow appearing above the eye and extending back as in adults and 

 of a creamy buff color. 



Geographical Range. The Falkland Islands. Southern South Amer- 

 ica from Tierra del Fuego north to Buenos Aires, Argentine Republic, 

 on the Atlantic coast ; and to Tarapaca, Peru, on the Pacific coast. 



The series of this plover obtained by the naturalists of the Princeton 

 University Expeditions are cited below. The birds appear to be chiefly 

 maritime and fairly common. They present a wide difference in appear- 

 ance at the two extremes of the year, and immature birds look very much 

 like the adults during the winter season. From Darwin's account are cited 

 the following notes as of interest. Under the heading of Squatarola cincta 

 (op. cit, contra) referring to this bird, he writes as follows: 



