364 



GEOGRAPHICAL ZOOLOGY. 



[PART iv. 



cosmopolitan ; Chaulelasmus (2 sp.), Palaearctic region and North 

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

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

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

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

 Palsearctic 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; Hymenol$imm (1 sp.),. New 

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

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

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

 and Palsearctic 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.), Palsearctic and Nearctic regions, Brazil, and the 

 Auckland Islands. 



FAMILY 119. LAKHXE. (13 Genera, 132 Species.) 

 GENERAL DISTRIBUTION. 



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 : 



Stercw*arius (6 sp.), cosmopolitan, most abundant in cold and 

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

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

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

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

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



