THE SIBERIAN PECTORAL SANDPIPER. 585 



coverts are moulted Feb. to May. N.B. — One ($ March) in worn 

 winter -plumage is moulting wings and tail and is acquiring new 

 winter, not summer, feathers. Crown rich tawny, streaked black ; 

 nape pink-buff, narrowly streaked sepia ; mantle and scapulars 

 black-brown, feathers edged tawny and light ash-brown ; rest of 

 upper -parts as winter ; ear-coverts buff streaked dusky ; chin and 

 throat white, heavily spotted sepia ; sides of neck and breast pink- 

 cinnamon, feathers with dusky-brown spots and V-shaped bars and 

 edged white ; flanks white or tinged pink-cinnamon and similarly 

 barred ; remaining under-parts, tail and wing as winter but new 

 innermost secondaries and coverts sepia, edged tawny and ash- 

 brown, new median and lesser coverts ash-brown, edged pink- 

 cinnamon. 



Nestling, — (Not examined.) 



Juvenile. — Crown and ' nape as adult summer ; mantle and 

 scapulars brown-black edged ochraceous-tawny and cream ; back, 

 rump and upper tail-coverts as adult ; eye-stripe white faintly 

 spotted dusky ; ear-coverts and sides of neck buff streaked sepia ; 

 cheeks white narrowly streaked or spotted sepia ; chin and throat 

 white, lower -throat warm buff narrowly streaked sepia ; breast 

 buff slightly streaked sepia at sides ; flanks white washed buff ; 

 remaining under-parts as adult ; tail as adult but outer pairs edged 

 light buff or white, central pair edged ochraceous-tawny ; wing as 

 adult but innermost secondaries and coverts sepia or black-brown 

 broadly edged ochraceous-tawny (without ash-brown edges), 

 median and lesser coverts sepia margined buff -white, innermost 

 median edged ochraceous-tawny, not ash-brown or cream-white as 

 adult summer. 



First winter. — As adult winter but distinguished by faded 

 ochraceous-tawny tips to innermost lower median coverts and by 

 worn light buff edges to retained juvenile coverts. Juvenile body- 

 feathers (apparently not feathers of back and rump, nor all scapu- 

 lars), sometimes central pair of tail-feathers, some innermost 

 secondaries and coverts but not rest of tail-feathers and apparently 

 not wings (one moulting 6th primary in each wing) are moulted 

 Oct. to Jan. (Not many specimens examined.) First summer. — 

 Apparently not to be distinguished with certainty from adult 

 summer. N.B. — One (Feb.) acquiring summer plumage was also 

 moulting remiges. 



Measurements and structure. — $ wing 127.5-138.5 mm., tail 

 45-58, tarsus 27-30.5, bill from feathers 23-27 (12 measured). ? 

 wing 124-133, bill 23-29. Primaries : 1st minute, 2nd longest, 3rd 

 sometimes equal, usually 2.5-4.5 mm. shorter, 4th 6-11 shorter, 

 5th 15-22.5 shorter, 6th 25-33 shorter. Longest inner secondary 

 between 4th and 6th primaries or sometimes equals 2nd. Tail 

 wedge-shaped, feathers pointed at tip, especially central pair. Bill 

 short, slender and tapering. Other structure as in C. a. alpina. 



Soft parts. — Bill black, base below brownish ; feet (ad.) dull 

 green-slate, (juv.) dirty (greyish) ochraceous ; iris dark brown. 



