364 



GEOGRAPHICAL ZOOLOGY. 



[PART IV. 



cosmopolitan ; Chaulclasmiis (2 sp.), Palrearctic region and North 

 America; Spatula (5 sp.), all Temperate regions; Malacorhynclms 

 (1 sp.), Australia ; Cairina (1 sp.), Tropical South America ; 

 Branta (1 sp.), Palsearctic region and India ; Fuligula (5 sp.), 

 North Temperate regions and New Zealand ; uEthya (5 sp.), 

 Palaearctic and Nearctic regions, India, Australia, and South 

 Africa ; Metopiana (1 sp.), South Temperate America ; Bucephala 

 (4 sp.), Nearctic and Palsearctic regions ; Harelda (2 sp.), North- 

 ern Palseartic and Nearctic regions ; Hymenolaimus (1 sp.), New 

 Zealand ; Camptolaimus (1 sp.), North-east of North America ; 

 Microptcrus (1 sp.), Temperate South America ; Somateria (5 

 sp.), Arctic and sub-arctic regions ; (Edemia (5 sp.), Nearctic 

 and Palaearctic regions; Biziura (1 sp.), Australia; Thalassornis 

 (1 sp.), South Africa ; Erismatura (6 sp.), all America, South- 

 east Europe and South Africa ; Nesonetta (1 sp.), Auckland 

 Islands ; Merganetta (3 sp.), Andes of Columbia to Chili; Mer- 

 gus (6 sp.), Palaearctic and Nearctic regions, Brazil, and the 

 Auckland Islands. 



Family 119.— LARIBM. (13 Genera, 132 Species.) 



General Distribution. 



Neotropical Nearctic Palaearctic Ethiopian Oriental Australian 



Sub-regions. Sub-regions. Sub-regions. Sub-regions. Sub-regions. Sub-regions. 



1.2.3.4 



1.2.3. 4 



1.2.3.4 



1 .2.3.4 



1.2.3. 4 



1.2.3 .4 



The Laridse, or Gulls and Terns, are true cosmopolites, in- 

 habiting the shores and islands of every zone ; and most of the 

 genera have also a wide range. They are therefore of little use 

 in the study of geographical distribution. The genera are as 

 follows : — 



Stercorarius (6 sp.), cosmopolitan, most abundant in cold and 

 temperate zones ; Blwdostethia (1 sp.), North America ; Larus 

 (60 sp.). cosmopolitan ; Xema (1 sp.), North Temperate zone ; 

 Greagrus (1 sp.), North Pacific ; Pagophila (1 sp.), Arctic seas ; 

 Rissa (3 sp.), Arctic and Northern seas; Sterna (36 sp.), cos- 

 mopolitan ; Hydrochelidon (12 sp.), Tropical and Temperate zones; 



