210 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



groove; nostril sub-basal, longitudinally linear, its upper edge oper- 

 culate; anterior outline of feathering at base of bill descending 

 obliquely downward and forward in a nearly straight line, from base 

 of culmen to lower edge of mandible, the mental antia very slightly 

 anterior to this point. Wing rather long, pointed, the longest pri- 

 mary (outermost) exceeding distal secondaries by a little more than 

 half the length of wing and extending decidedly beyond tips of 

 longest tapering but round-tipped tertials. Tail about two-fifths as 

 long as wing, truncate or slightly rounded (E. mauri) or slightly 

 emarginate on each side (doubly emarginate), with four middle 

 rectrices longest; rectrices 12. Tarsus longer than exposed culmen 

 {E. pusillns, male) to decidedly shorter (E. mauri, female), equal to 

 one-fourth the length of wing or slightly less, continuously scutellate 

 anteriorly and posteriorly; bare portion of tibia shorter than middle 

 toe without claw, scutellate before and behind; middle toe with 

 claw as long as or very slightly shorter than tarsus in E. pusilluft, to 

 decidedly shorter (about six-sevenths) as long in E. mauri; lateral 

 toes decidedly shorter than middle toe, the outer longer than the 

 inner; claws rather long, slender, moderately curved; basal phalanges 

 of anterior toes united by web, that between the outer and middle 

 toes much larger than that between inner and middle toes. 



Coloration. — Above mostly brownish gray, beneath whitish. In 

 summer adult spotted with blackish and more or less tinged or inter- 

 mixed with rusty. 



Range. — North America, migrating to South America and West 

 Indies. (Two species.) 



KEY TO THE SPECIES OF EREUNETES. 



a. Bill shorter (17-20, averaging 18.6 in male, 18-22, averaging 20.3 in female); 

 summer adults with little of rusty on upper parts, the prevailing color above being 

 grayish brown; chest narrowly streaked with diisky; young with little of rusty or 

 ochraceous on upper parts. (Eastern North America, breeding along Arctic coast 

 westward to Point Barrow, Alaska; Middle and South America in migration.) 



Ereunetes pusillus (p. 210). 



aa. Bill longer (20.5-23.5, averaging 22.5 in male, 23-28, averaging 25.9 in female); 

 summer adults with upper parts chiefly rusty or cinnamon-rufous, the chest with 

 broad streaks or triangular spots of dusky; young with much rusty, and ochraceous 

 on upper parts. (Western North America, north to coast of Bering Sea.) 



Ereunetes mauri (p. 215.). 



EREUNETES PUSILLUS (Linnaeus). 



SEMIPALMATED SANDPIPER. 



Adults in summer. — Above light grayish brown, or brownish gray, 

 the sides of pileum and some of the scapulars and interscapulars 

 tinged with pale bufTy cinnamon, but this sometimes whoUy absent; 

 pileum heavily streaked and dorsal region heavily spotted with 

 black, the latter occupying the central portion of each feather; rump, 



