200 



from tho former in comparatively recent times. It is rather the 

 distribution of the species in South America and its route across 

 the Andes which requires explanation. 



(i-c. c? 2 ^d. et Buenos Ayres, April (Bui 

 juv. sk. meister). 



H. Saunders Coll. 



d. S ad.* 



Buenos Ayres, Nov. (Bur- H. Saunders Coll. 

 meister) . 

 e-l. cj' Jad., imm., Ajo, Buenos Ayres, Aug., H. Samiders Coll. 



et j uv. sk. Sept., ife Nov. (Ei'nest Gibson) . 



m,n. c? $ ad. sk. Belgrano, Buenos Ayres, April. H. Durnford [C.]. 



Belgrano, Buenos Ayres, Salviu-Godmau Coll. 



]\[arcb (H. D.). 

 Callao Bay, Peru, Dec. (R. H. Saunders Coll. 



Jtmijj). 

 Payta, Peru, Jan. (Adml. H. Saunders Coll. 



A. H. Markhmn). 

 Payta, Peru, July (Commr. H. Saunders Coll. 



MacFarlmie). 

 West Africa. Zoological Society 



[P.J. 

 Gambia. Mr. Kendall [C.]. 



Gambia (Sir A. Molony). Shelley CoD. 



Gold Coast. R. B. Sharpe, Esq. 



[P.]. 

 Walvisch Bay (C. J. Anders- H. Saunders CoU. 



son). 

 Durban Bay, Dec. (Gordge). 

 z, a',b'. S $ fid. et Durban Bay, (Gordffe). 



inim. sk. 

 /', d'. Ad. sk. Zambesi (Bradshcnv). 



c'. Ad. sk. Lake Ngami (Chapman), 



e'-i'. Ad. sk. Lake Sbirwa, Nyassaland, 



1st June, 1893. 

 k'. Ad. sk. Ujiji) Lake Tanganyika. 



H. Saunders C(j11. 

 Shelley Coll. 



Tweeddale Coll. 

 H. Saunders Coll. 

 H.H.Johnston, Esq., 



C.B. [P.]. 

 H. Saunders Coll. 



10. Larus maciilipennis. 



Gabiota cenicienta (partini), Azara, Apunt. iii. pp. 350, 352, lin. 1 

 (1802: Paraguay). 



Gabiota blanca, Azara, Apinii. iii. p. 363 (1802: Paraguay). 



Lnrus maculipennis, Licht. Verz. Boubl. p. 83 (1823 : Monte Video f) ; 

 &cl. Sf Salv. Ncmencl. Av. Ncotrop. p. 148 (1873) ; Buniford, Ibis, 

 1878, p. 43 (Chuput Valley, Patagonia); id. t. c. p. 202 (prov. 

 B. Ayres); id. op. cit. 1878, p. 405 (Central Patagonia, breeds); 

 Saunders, P. Z. S. 1878, p. 201 (i-evision Lavinse) ; id. Journ. Linn. 

 Soc, Zool. xiv. p. 399 (1878: distribution); Gibson, Ibis, 1880, 

 p. 163 ; White, P. Z. S. 1882, p. 028 (Buenos Ayres) ; Withington, 

 Ibis, 1888, p. 472 (Buenos Ayres) ; Scl. ^ Huds. Argent. Orn. ii. 

 p. 198 (1889); Saunders, P.'Z. S. 1891, p. 373 (eggs) ; Oustalet, 

 Miss. Sc. Cop Horn, vi. (1891) p. .308 ; Holland, Ibis, 1892, p. 213 ; 

 Aplin, Ibis, 1894, p. 211 (Monte Video). 



Xeuia (Chroicocephalus) cirrhocepbalum, Darwin (nee Peale), Zool. 



* Head and wing only ; the wing pattern is the most mature knonu. 

 t Type in Berlin Museum examined. 



