410 Pr. A. Hall 071 the Mammals and Birds 



with white, the secondaries broadly so ; the closed wings extend- 

 ing two inches beyond the tail. In winter, the hood is wanting, 

 and the young birds have a subterminal band of black on the 

 tail, while their dorsal and ventral aspects are brownish, tipped 

 with rusty white. Length of an adult 17 inches; alar expanse 

 36 inches. A specimen of this bird is in the Museum of the Nat- 

 ural History Society ; it is a rare one in this vicinity. 

 L. tridactylus. Kittiwake Gull. 

 L. rissa of Pennant ! 

 L. rissa tridactyla. Baird ! 



v.s.p. Bill of the old bird yellowish ; of the young bird 

 black, brownish at the base ; legs and feet yellowish, (black ac- 

 cording to Nuttall) ; orbits orange ; irides hazel ; eggs 3, olivace- 

 ous white spotted light and dark grey. 



Old bird summer plumage. Mantle bluish grey ; 5 exterior 

 quills and outer web of 1st black ; 4th and 5th tipped with 

 white ; all the other parts white. In winter plumage, the occiput 

 and neck are French grey, and the rictu-orbital space streaked 

 with black. A young bird before me presents the following cha- 

 racters : 



Crown of head, occiput, and scapulars grey skirted with brown- 

 ish white ; rump and wing coverts, except the upper row of the 

 small wing coverts which is brownish black, bluish ash colour ; 

 tail wdiite with a subterminal band of black, and tipped with 

 white ; all the primaries black towards the extremities, the black 

 running down the outer and inner margins in a narrow streak ; 

 the whole outer vanes of the 1st primary black ; all the primaries 

 except the 1st tipped with white ; auriculars brown. 



Ventral aspect white. 



1st primary longest ; length 14 inches ; alar expanse 30 inches ; 

 the tarsus and web have dried pure white, so that I doubt very 

 much whether a black colour, as given by Nuttall, could even 

 characterize this part in the young bird. I have never met with 

 an old specimen. 



L. canus. Common Gull or Mew. 



V.S.P. Bill yellow ; legs and feet blackish grey, blotched with 

 yellow on the webs ; irides hazel ; eggs 3, bluish or ochraceous, 

 spotted with cinereous and blackish. 



Summer plumage. Mantle bluish grey ; the first six primaries 

 with black near the tips, forming a narrow bar on the 6th ; the 



