576 MESSRS. SCLATER AND SALVIN [June 20, 



Sect. b. Larus. 



5. Larus argentatus, Briinn. 



Larus argentatus, Briinnich ; Baird, B. N. A. p. 844. 



Larus smithsonianus, Coues, Pr. Ac. Phil. 1862, p. 296; Gundl. 

 Rep. F.N. i. p. 391. 



Hab. Coast of Cuba, ace. (Gundlach). 



This is probably only a straggler into the northern part of the 

 Neotropical region. 



6. Larus dominicanus. 



Larus dominicanus, Licht. Douhl. p. 82; Max. Beitr. iv. p. 850; 

 Gray, Gen. of B. hi. pi. 180 ; Darwin, Zool. Voy. Beagle, iii. p. 142 ; 

 Gassin, Gilliss's Exp. ii. p. 204 ; Ph. et Landb. Cat. Av. Chil. p. 47 ; 

 Gould, P. Z. S. 1859, p. 97 ; Sclater, P. Z. S. 1860, p. 390 ; Abbott, 

 Ibis, 1861, p. 165. 



Larus vociferus, Burm. Syst. Ueb. iii. p. 448, et La Plata-Reise, 

 ii. p. 518. 



Larus azarce, Pelz. Orn. Novara Exp. p. 151 ; Orn. Bras. p. 323. 



Hab. Coast of Brazil {Licht., Max., Burm.); Ilha de Marambaya, 

 Sapitiba (Natterer) ; Pampas of Buenos Ayres (Darwin) ; coast of 

 Chili (Ph. et Landb.) ; Falklands (Abbott). 



Of this Neotropical representative of Larus fuscus of our seas 

 there are now living examples in the Society's Gardens from the 

 Falkland Islands and from Chili. They are readily distinguishable 

 from their European allies by their darker mantle and pale flesh- 

 coloured legs. L. dominicanus appears to be a very abundant species 

 on both coasts of South America, from the extreme south up to 

 Southern Brazil on the east, and Peru on the west. 



Sect. c. Chroocephalus*. 



The Neotropical Hooded Gulls in their adult plumage may be 

 shortly diagnosed as follows : — 



a. primariis extemis totis nigris 1. atricilhi. 



b. primariis ext. albo nigroque variegatis. 



a. cucullo nigro. 

 "major: pallio dilute cinereo secundariis con- 1 



'■»•■• S Wi tM / 1 ff It If ^ . 



coloribus J 



minor: pallio obscure cinereo secund. albo] „ frmiklini 

 terminatis J 



b. cucullo brunneo 4. glaucodes. 



c. cucullo plumbeo 5. cirrhocephal/is. 



7. Larus atricilla. 



Larus atricilla, Linn. Syst. Nat. i. 225 ; Natt. Orn. Bras. p. 323 

 Sund. Ofv. af K. V. A. F. 1869, p. 590. 



Larus ridibundus, Leotaud, Ois. de Trin. p. 532. 



* Usually written Chroicocephahis, or Chroscocepkalus as amended by Strick- 

 land. But if, as we suppose, the derivation is XP^' XP°°*> c °l° r > tins is the 

 proper orthography. 



