570 MESSRS. SCLATER AND SALVIN ON PERUVIAN BIRDS. [Nov. 26, 



;)2. Urubitinga unicincta. 



^3. Buteo erythronotus. 



54 . Hypotriorchisfemoralis. 



55. Tinnunculns sparverius. 



56. Circus poliojiter us. 



57. Strix j)erlata. 



58. Glaucidium infuscatum. 



59. Pholeoptynx cunicularia. 



IV. CoLTJMBiE. 



60. Zenaidu auriculata. 



61. Metriopelia aymara. 



62. Chatncepelia erythrothorax. 



63. ci'uziana. 



Y. GallinjE. 



61 . Tinamotis pentlandi. 



VI. Grall^. 

 65. (Edicnemus super ciliaris. 



66. 

 67. 



C8. 



6!;. 



70. 

 71. 

 72. 



73. 

 74. 

 75. 

 76. 



77. 



78. 

 79. 

 80. 

 81. 



82. 

 83. 



Charadrius virffinicus. 

 yEgialites vociferus. 



nivosus. 



Oreophiliis rujicollis. 

 Thinocorus rurnicivorus. 



orbignyanus. 



Calidris arenaria. 

 Tringa bairdi. 

 Numerius hudsonicus. 

 Rallus rythirhynclius. 

 Gallinula galeata. 

 Fulica ardesiaca. 



VII. Anseres. 



Anas cristata. 

 Querquedula oxyptera. 

 Erismatura ferruginea. 

 Podilymbus antarcticus. 

 Larus bonapartii, 

 belcheri. 



The most complete account yet given of the fauna of "Western Peru 

 is that of Tschudi, wlio, in his * Fauna Peruana,' includes 101 species 

 as inhabiting the three zones of elevation into which he divides the 

 western slope of the Andes, Mr. Whitely's series, however, is suf- 

 ficiently perfect to enable us to point out shortly some of the more 

 salient features of this peculiar fauna, as compared with that of the 

 corresponding eastern slope of the same range. These are : — 



1 . The extreme poverty of the avifauna in species — particularly in 

 the Passeres and higher groups. 



2. The entire absence of the great forest-loving families Formica- 

 riidse, Cotingidse, Galbulidse, Momotidse, Bucconidse, Trogonidse, 

 Ramphastidae, Capitonidse, and Cracidse, which form such charac- 

 teristic features of the ornithology of every part of Eastern Tropical 

 America. 



3. The almost entire absence of the families Tanagridse, Dendro- 

 colaptidse, Picidse, and Psittacidse, which are, for the most part, of 

 similar habits. The Tanagridse, so numerous in most parts of 

 Tropical America, are represented by three or four species in Western 

 Peru, the Dendrocolaptidse by seven or eight species belonging 

 mostly to peculiar genera. One Woodpecker (Colaptes rupicola) 

 only is to be met with, and but two Parrots. 



4. The most characteristic genera of this fauna are, perhaps, 

 Phrygilus, Xenospingus, Cinclodes, Muscisaxicola, Centrites, Mus- 

 cigralla, Thinocorus, and Oreophiliis. Of these, Xenospingus and 

 Mnscigralla are monotypic forms peculiar to the district, whilst the 

 remainder, with scarcely an exception, belong stiictly to the Pata- 

 gonian province of tlie Neotropical region, ranging, however, in many 

 instances northwards along the higher plateaux of the Cordillera into 

 New Granada, and affecting a greater elevation as they advance. 



