Pectoral Sandpiper 113 
Distribution.—A rare bird, breeding far north and only known to do 
so slong the shores of the Arctic Ocean, and in the Mackenzie Province ; 
south in winter through the United States chiefly east of the Rocky 
Mountains, to the West Indies and South America as far as Peru and 
Brazil. 
The Stilt-Sandpiper is a rare migrant in Colorado, and has been 
chiefly met with on, the plains east of the range. It appears to arrive 
late from the south ; the earliest date is May 14th, when Aiken, took a 
female near Colorado Springs. The other records are: Fort Lyon, 
May 22nd, Loveland, May 20th, Middle and South Parks and Brecken- 
ridge (Carter), near Denver in the fall (Smith), Boulder co., record 
rather doubtful (Henderson), Barr, common on migration (Hersey 
& Rockwell). 
Genus PISOBIA. 
Bill moderately long and slender, about equal to the tarsus; wings 
long and pointed; outer primary usually the longest; tertials also 
lengthened and pointed; tail rather long and doubly emarginate ; 
the two central tail-feathers usually projecting; tibia bare towards 
the joint; tarsus with transverse scutes before and behind; hind too 
present, front toes long, slender and cleft to the base. 
A large genus of highly migratory birds, breeding chiefly far 
north in both hemispheres, and wintering in the temperate and 
tropical zones. All the four regular North American species pass 
through Colorado. 
Kery oF THE SPECIES. 
A. Rump and upper tail-coverts black, at any rate centrally. 
a. Larger; wing 5-4; breast dark ashy, and heavily streaked 
with dusky. P. maculata, p. 113. 
b. Medium; wing 4-8; breast lightly suffused with ashy, 
streaking faint. P. bairdi, p. 115. 
ce. Smaller; wing 3-3; chest spots heavier. P. minutilla, p. 115. 
B. Rump dusky, upper tail-coverts white. P. fuscicollis, p. 114. 
Pectoral Sandpiper. Pisobia maculata. 
A.O.U. Checklist no 239—Colorado Records—Ridgway 73, p. 187; 
Drew 85, p. 18; Morrison 88, p. 139; 89, p. 167; Cooke 97, p. 65; 
Rockwell 08, p. 159; Hersey & Rockwell 09, p. 115. 
Description.—Adult in summer—Above black, the feathers edged 
with pale ochraceous-buff ; rump and upper tail-coverts black, lightly 
tipped with buffy ; middle tail-feathers longest, pointed and margined 
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