578 MESSRS. SCLATER AND SALVIN [June 20, 



Fine adult specimens of this Gull received from the lakes of 

 Mexico agree well with Wagler's description of his Larus pipixcan 

 from the same locality. On the Pacific coast of Guatemala Salvin 

 obtained one specimen in immature plumage, and saw others. The 

 skin thus collected was identified by Dr. Coues as Larus cucullatus, 

 who likewise records the occurrence of this species under this name 

 as far south as Panama (Proc. Acad. Sc. Phil. 1862, p. 309). 



The fact of this Gull extending still further southwards, to Peru 

 and Chili, is somewhat remarkable, but there seems to be little doubt 

 on the subject. A specimen of Larus franklini in the British 

 Museum is stated to have been obtained at Valparaiso by Burnett 

 and Fitzroy ; and a skin in immature plumage (exactly resembling 

 the Guatemalan specimen) was purchased of the Maison Verreaux, 

 marked " Chili." Besides this evidence, Messrs. Philippi and Land- 

 beck's description of their L. cinereo-caudatus agrees accurately with 

 L. franklini {cf. Sclater, P. Z. S. 1867, p. 336). 



In the immature birds of this species the primaries are nearly 

 uniform dark brown, whitish on the inner web, and the tail has a 

 broad black subterminal band. 



10. Larus glaucodes. 



Larus glaucodes, Meyen, Obs. Zool. p. 115, pi. 24 ; Burm. Syst. 

 Ueb. iii. p. 449 ; Cassin, Gilliss's Exp. ii. p. 204 ; Ph. et Landb. 

 Cat. Av. Chil. p. 48. 



Larus glaucotis, Schlegel, Mus. des P.-B. Lari, p. 42. 



Gavia glaucotis, Blasius, J. f. Orn. 1865, p. 374. 



Larus albipennis, Licht. MS. 



Gavia roseiventris, Gould, P. Z. S. 1859, p. 97. 



Larus roseiventris, Scl. P. Z. S. 1860, p. 391; Abbott, Ibis, 1861, 

 p. 166. 



Hab. Coast of Chili {Meyen) ; Falkland Islands {Abbott et Pack). 



All the Patagonian and Chilian specimens of this Gull that we 

 have met with belong, in our opinion, to one species, for which 

 Meyen's name is the first. Skins from the Falkland Islands {Gavia 

 roseiventris, Gould) are quite undistinguishable from Chilian exam- 

 ples, as Prof. Blasius (after examining Gould's type) has already 

 stated*. 



11. Larus cirrhocephalus. 



Gaviota cenicienta, Azara, Apunt. iii. p. 350. 



Larus cirrhocephalus, Vieill. N. D. xxi. p. 500, et E. M. p. 345 ; 

 Gal. Ois. ii. t. 289; Scl. et Salv. P. Z. S. 1869, p. 146; Hudson, 

 P. Z. S. 1870, p. 802. 



Larus poliocephalns, Temm. Man. d'Orn. ii. p. 780 (1820); Max. 

 Beitr. iv. p. 854. 



Cirrhocephalus phanbeiceps, Bruch, Journ. f. O. 1855, p. 288. 



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

 Reise, ii. p. 518. 



Hab. Pampas of La Plata {Azara, Burm.). 

 * Journ. f. Orn. 1865. p. 374. 



