JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 409 



120. Ereunetes mauri CABANIS. 

 WESTERN SANDPIPER. 



Ereunetes occidentalis Lawr., A. O. U. Check List, 1895, P- 9 1 - 



Distr.: Chiefly western North America, breeding in high latitudes; 

 not uncommon on the Atlantic coast; south in winter to Middle and 

 South America. 



Adult: In summer plumage this species may be distinguished 

 from E. pusillus by its longer bill (which is oftentimes 1.25 inches 

 in length, while E. pusillus rarely, if ever, has the bill one inch), 

 by its decidedly streaked breast, and the feathers of the back being 

 margined with rufous. The winter plumages, however, differ but 

 little, if any, and occasionally specimens of the Western Sandpiper 

 occur which have the bill less than one inch, and in such cases it 

 is almost impossible to. distinguish them from winter examples of 

 E. pusillus; therefore it is perhaps as well to consider all of those 

 birds having bills less than .90 in length to be E. pusillus, and 

 if it is important to have the identification absolutely accurate, they 

 could easily obtain the opinion of some professional ornithologist to 

 decide such a fine point. 



Length, 6; wing, 3.85; tarsus, .82; bill, .90 to 1.15. 



Common in Illinois and Wisconsin during the migrations, but 

 much less numerous than the preceding species. 



Genus CALIDRIS Illiger. 



121. Calidris leucophaea (PALLAS). 

 SANDERLING. 



Calidris arenaria Linn., A. O. U. Check List, 1895, p. 91. 



Distr.: Northern hemisphere; in America breeding in the Arctic 

 and subarctic regions; south in winter as far as southern South 

 America (Patagonia), also India and South Africa. 



Adult in summer: Head, throat, and upper parts, except rump, 

 reddish brown, black, and white; throat and breast, pale rufous 

 brown, with more or less dark spots; belly and under parts, pure 

 white; bill and feet, black; toes, three. 



Adult in winter: Top of the head and back, ash gray, the shafts 

 of the feathers being brown; forehead and entire under parts white; 

 bill, black. 



Length, 8.10; wing, 5.05; tarsus, i; bill, i. 



