118 \Birds of Colorado 
been seon at Fort Lyon, May lst (Thorne), near Pueblo, May 17th 
(Beckham), in El Paso co., May Ist (Allen & Brewster), at Horse 
Creek, May 17th (Aiken coll.), and at Loveland, May 6th (W. G. Smith). 
I have not heard of any fall records though it doubtless returns 
south through the State. 
Western Sandpiper. Hreunetes mauri. 
A.O.U. Checklist no 247.—Colorado Record—Cooke 97, p. 66 
(EZ. occidentalis). 
Description.—Closely resembling Z. pusillus but with a much longer 
bill, averaging -88 in the male and 1-05 in the female, against -72 
and -84 respectively. 
Distribution.—Breeding chiefly in western Arctic America; south 
on migration mostly in, the west but also on the Atlantic coast, in winter 
to Central and South America. 
In Colorado this Sandpiper is of rare occurrence on migration. 
Cooke gives only three records: Loveland, May 12th and July 4th 
(Osburn), and near Pueblo in the fall (Lowe). 
Genus CALIDRIS. 
Bill moderate, about equal to the tarsus; resembling Pisobia 
in other respects, but with no hind toe ; anterior toes cleft to the base, 
without webs. 
The genus contains only the Sanderling, « cosmopolitan species. 
Sanderling. Calidris leucophea. 
A.O.U. Checklist no 248—Colorado Records—Cooke 94, p. 183; 
(Calidris arenaria); H. G. Smith 96, p. 65; Cooke 97, pp. 66, 158 ; 
Hersey & Rockwell 09, p. 115. 
Description.— Adult in summer—Above mottled black, white and 
tawny-rufous; wings with the primaries dusky, paler on the inner 
web, and with white shafts, secondaries also with a good deal of white ; 
rump and upper tail-coverts dusky centrally, white on the sides ; below 
white, the throat and breast sometimes slightly spotted with dusky 
and tawny ; iris, bill and legs black. Length 7:5; wing 4-8; tail 2-0; 
culmen -95; tarsus -95. . 
Adults in winter have no tawny; upper-parts ashy-grey, generally 
with dusky shaft-stripes and lighter edges; under-parts pure white. 
In any plumage the absence of the hind toe at once distinguishes this 
from other Sandpipers. 
Distribution.— Breeding far north ; eggs have been taken on the Arctic 
Coast near Franklin Bay, in Mackenzie and in Greenland ; on migration 
