412 SCLATER AND SALVIN ON NEOTROPICAL ANATID.fi. [Apr. 4, 



we have the following 23 species of Neotropical Anatidae belonging 

 to genera also met with in the north — namely 



Bernicla melanoptera, Querquedula flavirostris, 



magellanica, andium, 



dispar, versicolor, 



poliocephala, 2)u>ia, 



rubidiceps, torquata, 



anfarctica, brasiliensis, 



Cygnus nigricollis, Dafila spinicauda, 



coscoroba, bahamensis, 



Anas specular is, Mareca sihilatrix, 



cristata, Spatula platalea, 



Querquedula cyanoptera, Mergus octosetaceus. 

 oxyptera, 



Lastly, there are 4 generic forms of Anatidse peculiar to the 

 Antarctic portion of the Neotropical region (Heteronetta, Meto- 

 piana, Tachyeres, and Merganetta), embracing the following six 

 species — 



Heteronetta melanocephala, Merganetta armata, 



Metopiana peposaca, turneri, 



Tachyeres cinereus, leucogenys. 



The Neotropical Anatidse may therefore be summarized as 

 follows : — 



A. Nearctic species, mostly occurring only in 



winter within the Neotropical Region .... 23 



B. Neotropical species. 



a. Species belonging to Tropicopolitan 



genera 8 



b. Representatives of a Cosmopolitan 



genus 2 



c. Peculiar species of genera also Arctic. . 23 



d. Species of peculiar Antarctic genera. . 6 



39 



62 



