BIEDS OF NOETH AXD MIDDLE AMERICA. 595 



Larus kumliem Brewster, Bull. Nutt. Oin. Club, viii. no. 4, Oct.. 1883, 216 (Cum- 

 berland Sound; coll. U. S. NaU Mus.;.— Park, Auk, i, 1884, 196 (Mohawk 

 River, New York, Jan. 28, 1884.) — Baird, Brewer, and Ridgway, Water 

 Birds N. Am., ii, 1884, 219. — Harvie-Brown, Proc. Roy. Phys. Soc. Edinb., 

 viii, 1885, ,301 (Newgummiloak. 64° :{0' W., 64° N.; crit.).— Reichexow and 

 ScHALOW. .Tourn. fiir Orn., 1885, 453 (reprint of orig. descr.). — ^American 

 Ornithologists' Union, Check List., 1886, and 2d ed.. 1895. no. 45; 3d ed., 

 1910. p. 37.— Saunders, Cat. Birds Brit. Mus., xxv, 1896, 288 (Cumberland 

 Sound, June 10). — Schalow, Vogel der Arktis, 1904, 144 (synonymy, range, 

 etc.).— Braislin, Auk, xxii, 1905, 168 (Rockaway Beach, Long Island. 

 March 8, 1898).— Allen (F. H.), Auk, xxii, 1905. 205 (Boston Harbor, Fob 19; 

 crit.); xxv, 1908. 296 (coast of Massachusetts in winter). — D wight. Auk, 

 xxiii, 1906, 36, pi. 1 (full descriptions; crit.). — Hantzsch. Journ. fiir Orn., 

 1908, 325 (Labrador).— Cooke, Bull. 292. IJ. S. Dept. Agric, 1915. 28, fig. 11, 

 (range and migrations). 



L[ariis] hwnlieni Coves. Key X. Am. Birds. 2d ed., 1884, 742. — Ridgway. Man. 

 X.Am. Birds, 1887. 27. 



[Lams] Jcumlinii Sharpr. Hand-iist, i. ISOi). 142. —Forbks mid Robin.son, 

 Bull. Liverp. Mus., ii. no. 2. 1899. oS, 



LARUS NELSONI Henshaw. 



NELSON'S GULL. 



Similar in coloration to L. kumlieni, but very much larger. 



Adults in summer (sexes alike). —Head, neck, rump, u}3per tail- 

 coverts, tail, and entire under parts, including axillars and ujuler 

 wing-coverts, immaculate pure white; back, scapulars, and wings 

 pale gray (between pale and pallid neutral gray, exactly as in L. 

 argentatus), the secondaries and five or six proximal primaries 

 broadly, but not abruptly, tipped with white; five distal primaries 

 marked subterminally with brownish gray as follows: Outermost 

 primary with outer web deep brownish gray to within about 76.2 mm. 

 of the tip (measured next to shaft), the inner web rather lighter gray 

 for about the same distance, but broadly edged with white (the gray 

 about 10 mm., the white about 20 mm. wide), this white confluent 

 with that of terminal portion; second primary (from outside) tipped 

 with white for about 61 mm., the brownish gray subterminal space 

 on outer web about 58.5 mm. long next to shaft, but nearly twice as 

 long (about 114 mm.) along the edge, the very oblique anterior out- 

 line very sharply defined against the pale gray of basal portion; third 

 primary tipped with white for about 23 mm., preceded by a brownish 

 gray area on outer web about 68.5 mm. long, the inner web being 

 pale gray, like basal portioji of outer web, but at about 63.5 mm. 

 from tip fades into white, the latter, however, interrupted by a sub- 

 terminal broad spot of mottled grayish, extending entirely across the 

 web; fourth primary tipped with white for about 25.5 mm., the outer 

 web then brownish gray for about 30 mm. along shaft and 63.5 mm. 

 along edge, the pale gray of the remaining portion perceptibly paler 

 next to the brownish gray subterminal space, the inner web having 



