LARID^ — THE GULLS AND TEIlNS — LAllUS, 



223 



(lislingiiished by the very differently slmped bill, the piiler color of the mantle, ftnil tlie totally different 

 iii.irkings of the jjriniaries. It is, in fact, much more closely allied to the larger race of L. anjcntatns, 

 tin? principal dilference consisting in tiie hrownlsh gray, and nnicli more restricted, instead of black, 

 spaces on the primaries. In all examples of L. unjentatus we have been aide to examine, the black 

 jiiirtion of the primaries involves a considerable portion of the inner webs ; but in the present bird 

 till? darker color is confined almost entirely to the outer web, the inner webs being pale peiU'1-gray, 

 like tiie mantle, and fadi..g into white at the end of the (juills. 



It is barely possilile that this specimen may represent a very old aryentatm with the black 

 i'ii<led to l)rownish gniy, and unusually restricted on account of great age ; but until this can be 

 priiven we prefer to keep it separate. At any rate, harm Ndsoiii a]ii>arently holds exactly the 

 same relatiim to Lams argcntatus t^mithsuiiUiuun that L. Kumlieui does to the smaller race of the 

 Herring Gull. 



Larus glaucescens. 



THE OLAUCOTJS-WINOED OVLL. 



Larim glaiwescens, Naum. Naturg. Viig. Ueutschl. X. 1840, 351. — LAWit. in Bainl's R. N. Am. 1858, 

 842. — BAlltn.Crtt. N. Am. H. IS;')!), no. 657. —t'orr.s, Pr. Ac. Nat. Sci. I'liilud. 18C2, 21)5 ; Key, 

 1872, 311; Check List, 1873, no. 545 ; 2d ed. 1882, no. 770 ; 1'.. N. W. 1874, 023. — Saundehs, 

 P. Z. S. 1878, 167. — UiDow. Norn. N. Am. B. 1881, no. 062. 



lAiriiH ((7laucus) (j/niicoplfrus, " Kn'Ti.iTZ," Bitreii, .1. f. 0. 1853, 101. 



"Litrits clia/mjiffnis," Lawh. in Bainl's B. N. Am. 1858, 843 (not of i.KiiT. 1854). — lUlUD, Cat. 

 N. A.a. B. 1859, no. 659. — Coui;s, Pr. Ac. Nat. .Sci. Pliilad. 1S62, 295. 



Had. North Pacific coast of North America, from Washington Tcn'Htory to Alaska. 



Si*. Char. Adult, in .vtmnur : Mantle delicate jiearl-blue (deeper than in hnnqitcrm'); prima- 

 ries similar, becoming slightly darker (the fourth and fifth abruptly) lerniinally, all abruptly tipped 

 witii white ; tiie outer (juill with the tip and a space of an inch or more in extent anterior to a 

 suiilcnuinal deep ashy spot white ; the sixth with a broad subterminal bar of deep ash, jirecedcd 

 and followed by white spaces. Rest of the plumage, including almost all the exposed portion 

 (if tlie secondariiw, snow-white. Ailnlt, in iriiitcr: Similar, but head and neck clouded (I) with 

 siioly grayish. Young, first plunwyc : Prevailing color deep .-ish-gray, nearly uniform helow, re- 

 lieved above by a coarse irregular spotting of grayish white, or pale dull bulf, the liead and neck 

 indistinctly streaked. Primaries and rectrices pale brownish gray, with somewhat of a glaucous 

 cist. iSill wholly dusky, brownish basally ; legs and feet brownish. Ynumj, firat irintir : Mantle 

 iiiixcil Imiwnish ash and pearl-blue ; primaries and tail uniform brownish ash-gray ; head, neck, 

 and lower parts grayish white, clouded with brownish gray, the lower surface nearly unil'orm 

 liriiwnisli gray. Hill yellowish on basal half and tip, the intermediate portion dusky black ; legs 

 and feet pale brownish (in skin). 



Wing, l(i.2r)-17.:}() (average, 10.92) inches ; tail, 7.r)()-S.2r> (7.81) ; culnien, 2.2n-2.r!0 (2.42) ; 

 depth of bill through angle, .aO-.i)() (.82) ; tarsus, 2.3r)-2.!)() (2.02) ; midtlle toe, 2.()ri-2.1."i (2.2:i). 

 (Six aihdts.) 



In tins species the form of the bill approaches decidedly to that so characteristic of L. ncci- 

 ikiilnlis and L. dominicanus, the angle being very prominent and the depth through the base 

 propi >rtionally narrow. 



Tliis largo and handsome Gnll boars a very close rosomblanee to, and is very nearly 

 as liirge as, the Burgomaster Gull of the Atlantic eoasts. It appears to replace that 

 species in the southern portions of the racilio waters. It is found on tlu; nortlieastern 

 coasts of Asia, and on the entire Pacilie eoast of North America almost as far south 

 as the ^rexican line. In most respects its habits api)oar to bear a very (dose resem- 

 l)laiu'(! to those of the (jfuurns, but it is not so ex(dusivtdy northern as that species. 

 It is abundant along the Arctic Ocean as far to the west iis tlu! ^Mackenzie Uiver, 

 along the banks of wliich it was found by Mr. Koss. It was met with on the shores 







