LARID.E — LARINuE: GULLS. 



997 



row, and half posterior to eye. Mantle pale pearl-blue, much lighter than in franklini. Ends 

 of inner secondaries and scapulars scarcely lighter than back. Primaries : shafts of first 5-G 

 white, except at extreme tips, the others dark-colored ; 1st, outer web and extreme tip black, 

 rest white ; 2d, white, its tip black for a greater distance than on 1st, and on one or both webs, 

 for a greater or less distance (sometimes half-way down the feather) narrowly bordered with 

 black; 3d to fitii, black at ends for about the same distance on each, the black bordering the 

 inner web much farther than the outer; inner webs of 3d and 4th, and both webs of 5th and 

 6th, of a rather lighter shade of the color of the back. Other primaries like back ; 7th and 8th 

 with a touch of black on one or both webs near tip ; 3d to (Jth primaries with a white or pearly- 

 white speck at extreme tip. As is not the case with either of the preceding species, the pri- 

 mary wiriii-coverts, bastard quills, etc., are wholly or in great part white, causiuir tlie wliole 



l;ou.4,.uu. 



•wing to be bordered with white as far as the carpus. Neck all around, and under parts, in- 

 cluding under wing-coverts, pure wliite ; belly rosy in breeding time. No difference in color 

 between the sexes. Adult, winter plumage: Bill light c(dorod at base below; feet flesli-color. 

 Crescent before eye, and patch below auricnlars, deep slate. Crown and occiput mottled witli 

 grayish-black and white. Back of neck washed over with color of mantle. Forehead, sides of 

 head and throat, white, continuous with white of under parts. Young, first winter: Bill 

 (lu.sky ficsh-color, except toward end ; feet light Hesli-ccdnr. Without slaty mottling of crown. 

 Auricular ])atch <listinct. Le.sser wing-coverts and scapulars dusky-brown. liirhter aloni; their 

 edges. Sicoiidaries with a patch of dusky near end, whidi on the inner 3 or 4 becomes re- 

 stricted to outer web. First jtrimary with about half the inner web along shaft, black ; 2d and 

 .■{d with outer webs wholly black, and a narrow lino of black on inner webs along shaft. Tail 

 with a subterminal brownish-blark bar. Very youny: Bill tlesh-color, dusky <m terminal 

 lialf. Crown of head, and neck behind to interscapulars, cli>uded with dusky bluish-gray, 

 heightening on sides of neck into light grayish-ochreous. Scapulars and middle of back light 



