270 



LONG-WINGED SWIMMERS — LONGIPENNES. 



Xcma Sabinii, Lawk, in Baird's B. N. Am. 1858, 857. — Baird, Cat. N. Am. B. 1859, no. 6SU. — 

 SAUNDBBS, P. Z. S. 1S7S, 209. — COUES, 2d Check List, 1S82, no. 790. 



Xcma Sabinci, Coues, Pr. Philad. Acad. 1862, 311 ; Key, 1872, 317 ; Check List, 1873, no. 558 ; 

 B. N. W. 1874, 66. — Hidgw. Norn. N. Am. B. 1881, no. 677. 



Xenta collaris, " Schreibebs," Boss, in App. Ross's Voy. Baf. Bay, II. 8vo ed. 1819, 164 (nee 

 SCHREIBERS, = Rhodostethia rosea] Cf. SAUNDEBS, P. Z. S. 1878, p. 209). 



Hab. Circumpolar Regions ; in winter migrating south, in America, to Maine, New York, the 

 Great Lakes, and Great Salt Lake, Utah. Very abundant in Alaska. Bermudas, one instance 

 (Saunders). Macabi Island, coast of Peru, lat. 8° S. (one specimen, fide Saunders, P. Z. S. 

 1878, p. 210). 



Sp. Char. Adult, in summer: Head and upper part of the neck plumbeous, bounded below 

 by a well-defined collar of black, widest behind ; lower part of the neck, entire lower parts, tail, 

 upper tail-coverts, and lower part of rump snow-white, the lower parts faintly tinged with delicate 

 rose-pink in some freshly killed specimens. Mantle deep bluish gray (nearly the same shade as in 



IP 



--^ ■ 



Larus Franklini), the secondaries pure white, becoming gradually pale grayish blue toward bases ; 

 most of the exposed portion of the greater coverts also -white, forming, together with the seconda- 

 ries, a conspicuous longitudinal white stripe on the closed wing. Four outer primaries black, 

 broadly tipped with white, the inner webs broadly margined with the same ; fifth quill with the 

 greater part of the inner w r eb, and about 1.75 inches of the terminal portion of the outer, white, 



the remainder black ; remaining quills white ; outer 

 border of the wing, from the carpal joint back to the 

 j§g=» primary coverts, including the latter and the alula;, 



uniform black. Bill black, tipped with yellow ; eyelids 

 !*-* red ; iris brown ; "feet dull lead -color, claws black" 



=* (L. M. Turner, MS.). Adult in winter : Similar to 



the summer plumage, but head and neck white, except 

 occiput, nape, and auricular region, which are dull 

 dusky plumbeous. Young, first plumage : Crown, nape, 

 back, scapulars, wing-coverts, and rump brownish gray, each leather bordered terminally with light 

 fulvous or pale grayish buff, this fulvous border preceded on the tertials, longer scapulars, etc., by 

 a dusky internal sub-border ; greater wing-coverts and secondaries white, as in the adult ; prima- 

 ries much as in the adult. Tail white, with a broad subterminal band of black, the tip narrowly 

 white or pale fulvous; upper tail-coverts and entire lower parts white. Bill dusky, brownish 

 toward the base ; feet light brownish (in the skin). 



Wing, about 10.75 inches; culmen, 1.00; depth of bill through angle, .30; tarsus, 1.25; 

 middle toe and claw, 1.25. 



