284 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Zool., lix, 1915, 384 (Demarcation Point, n. e. Alaska, breeding; Herschel 



Island, Aug.; Providence Bay, n. e. Siberia, June 11; habits). 

 Erolia hairdii Hartbrt, in Hartert, Jourdain, Ticehurst, and Witherby, Hand-list 



of British Birds, 1912, 176; Novit. Zool., xxiii, 1916, 91 (Africa; Siberia; crit.). 

 Tringa maritima (not of Briinnich) Russell, Expl. Far North, 1898, 259, part 



(Herschel Island, 3 specs., July 13 to Aug. \A)fl 



PISOBIA FDSCICOLLIS (Vieillot). 



BONAPARTE'S SANDPIPER. 



In summer plumage (only) resembling P. hairdi, but readily 

 distinguished by the white (instead of dusky) median upper tail- 

 coverts and much more broadly streaked as well as less buffy (nearly 

 pure white) chest. 



Adults in summer (sexes alike). — General color of upper parts light 

 grayish brown or brownish gray, more or less tinged on crown, back, 

 and mnermost scapulars with light rusty or cinnamon, the feathers 

 of pileum and hindneck, scapulars and mterscapulars, black medially, 

 productmg conspicuous streaks, broadest and more spot-like on dorsal 

 region; wing-coverts grayish brown or brownish gray, darker cen- 

 trally and paler on margins and with indistinct shaft-streaks of 

 dusky, the greater coverts narrowly tipped with white; primary 

 coverts and remiges dark brownish gray or dusky (the secondaries 

 and proximal primaries somewhat lighter), the secondaries narrowly 

 edged with paler and margined terminally (more broadly on proximal 

 ones) with dull white; tertials dusky graj'ish brown medially, passing 

 into much lighter grayish brown toward edges; rump dusky grayish 

 brown, the feathers margmed with pale grayish buffy or buffy gray- 

 ish; upper tail-coverts white, the median ones immaculate, or nearly 

 so, the lateral ones with a cuneate dusky marking on outer webs; 

 tail grayish brown, very dark (dusky) on middle pair of rectrices, 

 much paler on lateral rectrices, all narrowly edged with paler and 

 (except median pair) narrowly margined terminally with whitish; 

 sides of head and neck and entire under parts white, the chin, upper 

 throat, breast, abdomen, anal region and (usually ?) under tail-coverts 

 immaculate, elsewhere streaked with dusky, the streaks broadest 

 (more or less guttate) on chest and sides of breast, becoming gradually 

 smaller and narrower anteriorly, the sides and flanks with irregular, 

 more or less hastate, spots and streaks of dusky, the under tail- 

 coverts sometimes with a few short shaft-streaks of dusky; maxilla 

 blackish, more brownish basally, the mandible brownish (in dried 

 skins) becoming blackish terminally; iris brown; legs and feet dusky 

 brownish (in dried skins). 



Wiiiter plumage. — Wings, rump, upper tail-coverts, and tail as in 

 summer; rest of upper parts brownish gray or grayish brown, the 



o Specimens examined by me. — R. R. 



