404 Field Museum of Natural History — Zoology, Vol. IX. 



Pectoral Sandpiper. 



feathers narrowly streaked with dark brown or blackish; upper tail 

 coverts, black; two middle tail feathers longer than the others; basal 

 half of bill, dull greenish yellow. 



Winter plumage: Breast, brownish buff, and upper parts, more 

 brownish. 



Length, 9; wing, 5.25; tarsus, 1.05; bill, 1.15. 



Common in Illinois and Wisconsin during the migrations, but not 

 nearly as abundant as formerly. A few remain during the summer. 

 but they are probably sterile birds, as none have been found breeding. 



115. Pisobia fuscicollis (Vieill.). 

 White-rumped Sandpiper. 



Tringa fuscicollis Vieill., A. O. U. Check List, 1895, p. SS. 



Distr.: Eastern North America, breeding in the far north; south 

 to the West Indies, Middle America and South America (to Falkland 

 Islands) in winter. 



Adult in summer: Top of the head and back, mottled with black, 

 dull white, and buff; throat, white; breast, finely lined with dark 

 brown; belly, white; an imperfect superciliary line of dull white; 

 rump, dusky gray, and most of upper tail coverts, white. 



Adult in winter: Top of the head and back, grayish, some of the 

 feathers marked with dark brown, giving it a slightly mottled appear- 

 ance on the back and top of the head; upper throat, white; breast, 

 ashy gray, the shafts of the feathers showing brown; belly, white; 

 forehead, whitish, extending in an imperfect superciliary line. 



