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



Purple Sandpiper. 



Bill, nearly straight ; back, dark ; 

 feathers, edged with ashy or buff; 

 breast, grayish, without brown 

 streaks; one or more of inner 

 secondaries almost entirely white; 

 legs and feet, yellow in life, pale 

 brown in dried skin. 



Arquatella maritima. 

 Purple Sandpiper. 

 See No. 113. 



SECTION 5. Toes, four, without web; bill, under i.io. 



Upper tail coverts, white; 



inner webs of primaries, 

 not speckled. 



Pisobia fuscicollis. 

 White-rumped Sandpiper. 

 See No. 115. 



Pisobia fuscicollis. 



Middle upper tail coverts, smoky or dusky, 



often tipped with buff; inner webs of 

 primaries not speckled; sides, white; 

 middle toe and claw, less than .95; legs 

 and bill, blackish. Pisobia bairdii. 



Baird's Sandpiper. 

 See No. 116. 



Pisobia bairdii. 

 Tail and upper tail coverts. 



Pisobia maculata. 

 Tail and upper tail coverts. 



Middle upper tail coverts, black, often 

 narrowly tipped with brownish buff; inner 

 webs of primaries, not speckled; middle 

 toe and claw, over .95; middle tail fea- 

 thers decidedly longer than the rest; legs, 

 yellowish olive; base of bill, dull olive; 

 tip, black. Pisobia maculata. 



Pectoral Sandpiper. Grass Bird. 

 See No. 114. 



