98 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Small web between outer and middle toe; bill, over .85; back, 

 greenish olive, sometimes banded; under mandible, pale yellow 

 (in life ) ; third primary and inner primaries with patch of white on 

 inner web. Actitis macularia. 



Spotted Sandpiper. 

 See No. 130. 



SECTION 2. Toes, four, without web. 



Belly, white; bill, black. Pisobia minutilla. 



Least Sandpiper. 

 See No. 117. 



Pisobia minutilla. 



SECTION 3. Toes, three; bill, over .75 inches long. 



Sanderling Sandpiper. 



Belly, white; basal half of outer webs of inner primaries, white; 

 back, mixed rufous, black and white, or grayish brown, or entirely 

 black (breeding), according to season; bill, about one inch long. 



Calidris leucoph&a. 

 Sanderling Sandpiper. 

 See Xo. T2i. 



