BIRDS. PALMIPEDES. 52. Larus. . 6$' 



244. L. crepidatus. Variegated olive-brown and yellow- 

 ish, beneath paler : shafts and tips of the quills 

 white : fore- part of the toes and webs black. 



Black-toed Gull. Et. Zool. t. 86. Lewin t. 217. Walcot t. 118. 



Length 15 inches : extent 39 inches: weight near 11 ounces. 



Bill dusky : iris dark brown-, head and neck with longitudinal 

 brown and whitish lines : plumage above edged with yellowish or 

 whitish, beneath crossed with the fame : outer webs of the quills 

 black, lower-part of the inner white : tail black with yellowish 

 bars, tipt with white : legs and part of the toes lead-colour. 



245. L. parasiticus. Head and chin black:: back and 

 wings blackish-lead-colour : neck, breast and belly 

 white : 2 middle tail-feathers very long. 



Arctic Gull. Brit. Zool. t. 87, Lewin t. 208. Wale. t. 116. 



Length 21 inches : weight 8 or 9 ounces. 



.Hi /I lead-colour at the bafe, black at the tip : front and temples 



white: neck with a reddish tinge behind: breast crossed with a 

 dark bar : bafe of the quills white on the inner-webs : 2 middle 

 tail-feathers 4 inches longer than the rest : legs black. 



Young bird entirely brown, paler beneath. 



B. Nostrils without cere. 



246. L. ritibundus. Whitish, head black : bill and legs 

 purplish-red. 



Black-headed Gull. Lewin t. 213. Walcot t. 115. Ft. Scot. t. 5. 



2. White, back grey : behind the ears a brown fpot. 

 Larus cinerarius. Linn. fyst. 



3. Whitish, head brown fpotted with white : back grey : to 

 middle tail-feathers with a black band. 



Larus erythroptcrus. Gmel. 



4. Above brown, beneath white : wings variegated brown and 

 re Y- 



Sterna Obfcura. Lath^Synops. Index ornithol. 



Length 15 inches : extent 37 : weight about 10 ounces. 



Bill slender : iris hazel : eyelids with a white spot on each side : 

 thin black : back and wings more or lefs ash colour : quills edged 

 and tipt with black. 



247. L. atricilla. White, head blackish: bill reel: legs 

 black. 



Laughing Gull. Will. Angl. t. 67. Montague Ornilh. Diet. 



Length 18 inches : larger than L. ridibundus. 



Much refembles the last, but the legs are black, and the head 

 larger, with a stronger bill. 



248. L. marinas. White, back and wings dusky lead- 

 colour : primary quills black, with broad white tips. 



Black-backed Gull. Lewin t. 209. Walcot t. 212. 



2. Back and wings grey : primary quills black towards the tip. 



3. Mixed brown grey and white: tail with ablack bar near the 

 end. Young bird. 



Wage! Gull. Br. Zool. t. 88. Lewin t. 210. 



Length 28 inches : extent 5 feet 8 : weight near 5 pounds. 



Bill strong, thick, yellow with an orange fpot on the lower man- 

 dible : iris yellow : eyelids orange : head and neck white : fecondary 

 quills more or lefs tipt with white ; legs flesh-colour. 



249. L.fuscus. White, back and wings cinereous: pri- 

 mary quills dusky, black towards the end, with a 

 white spot near the tip : legs yellow-orange. 



Herring Gull. Br. Zool. t. 88. Waktt t. 113. 

 Length 23 inches : extent 52 : wei<>/ie 33 ounces. 



