ZOOGEOGRAPHICAL REGIONS 



Geographical 

 Distribution 



teeth and are used to pierce the skin. In the Diptera the piercing 

 appendages may be the mandibles and first maxillae, or the second maxillae, 

 while the sucking tube is formed by the outgrowth from the pharynx of 

 two spatulate slips, one dorsal and the other ventral. Secondary modifi- 

 cations, such as flattening of the body, leathery consistence of the skin, 

 etc., are developments consequent on the adoption of a parasitic habit. 



For the purpose of defining the distribution of animals, the surface of 

 the earth is divided by zoologists into certain areas. 

 According to Wallace, Sclater, and others, there are six 

 regions, as follows : 



Europe, the temperate parts of Asia, and the 

 north of Africa ; Iceland and the islands in the 

 Atlantic. It is limited by the Himalayas and 

 the Indus. 

 Africa, including its islands, except the north ; 



Arabia. 



India and the neighbouring islands, Ceylon, 

 Java, Borneo, etc. ; it includes also the 

 Philippines. 

 The Continent of Australia, New Zealand, the 



Celebes, and the neighbouring islands. 

 America north of Mexico, and Greenland. 

 Mexico, the West Indies, Central arid South 

 America. 



Palaearctic : 



Ethiopian : 

 Oriental, or Indian 



Australian : 



Neartic : 

 Neotropical : 



