KEY TO THE WATER BIRDS OF FLORIDA. 279 
SupcENus PELIDNA Cvuv. 
TRINGA ALPINA PACIFICA (Cowes). 
Red=backed Sandpiper, 
Adult in summer: The feathers on the top of the head and 
back bright rufous brown heavily blotched with black on the 
central part of each feather; throat whitish ; breast streaked 
with black; belly black on the upper part, becoming white on 
the lower belly and crissum ; bill black. 
Adult in winter: Upper parts gray, slightly mottled ; 
throat white; breast gray, the shafts of the feathers dark 
brown; belly and under tail coverts pure white; a faint dull 
white superciliary line. 
Length, 8; Wing, 4.75 ; Tarsus, 1.10; Bill, 1.65. 
Ranges throughout North America, breeding far northward. It occurs 
on the Atlantic coast during migrations. 
The eggs are buffy white, sometimes bluish white, mottled with chocolate 
at the larger end. 
Suscenus ANCYLOCHEILUS Kavr. 
Genus EREUNETES Ixticer. 
EREUNETES PUSILLUS (Linn.). : eae? pusillus 
oot). 
Semipalmated Sandpiper. 
Adult in summer: Heavily marked with dark brown 
and tawny on the top of the head and back; forehead 
whitish ; under parts and throat white; breast mottled with 
grayish ; belly white; toes with small web. 
Adult in winter: Upper parts grayish, mottled with brown 
on the head, and the feathers showing dark brown edged with 
white on the back; throat white; breast very faintly washed 
with gray, which is sometimes very indistinct; belly and 
under tailcoverts white ; foes with small web. 
Length, 6.25; Wing, 3.70; Tarsus, .75; Bill, .80. 
Ranges from Labrador southward to the West Indies, and is common on 
the Atlantic coast during migrations. This species may be distinguished 
from the Least Sandpiper by the partly webbed toes. 
