GULLS. 



69 



feathers, and sometimes the wing-coverts, with a black spot at their tips. L., 

 17-00 ; W., 13-25 ; T., 5-50 ; B., 1-35. 



Jiamje. — " Arctic »cas, south in winter on the Atlantic coast of North 

 America to Labrador and Newfoundland, casually to New Bruu»wick, and on 

 the Pacific i^ide to Boring Sea" (A. U. U.). 



Lonjj Island, A. V., one record. 



A'<-*<, of ffrass, moss, and fcatliers on rocky cliffrt. ///;//*, litrht yellowish 

 olive, marked with small blotches of brown and larger cloudings of lilac, 

 2-45 X 1-70 (Brewer). 



"The Ivory Gulls appear to spend most of the time amid the pack- 

 ice, often at a long distance from land' (Chamberlain). 



d 



Fio. 00— First primaries of adnll Oiills. seen from below: fa) Am. Horring 

 Oull : {lA Ring-billed Gull ; (c) Laughing Gull ; (d) Franklins Gull ; (e) Bona- 

 parte's Gull. 



40* Rissai tridSiCtyUk rZ7N7>.). Ki-rriWAKR. A<l.!n niimmer.—Ui'n(\, 

 neck, tail, and under parts pure white; back and wings pearl-gray; outer 

 web of lirst primary and 3-00 of the ends of first and second primaries black ; 



