GEOGRAPHICAL DISTRIBUTION OF ORGANISMS. 



483 



primary and secondary divisions have been proposed. 

 I give that which is most generally adopted — viz., that of 

 Mr. Sclater and Mr. Wallace. According to this scheme 

 there are six primary regions, each subdivided into four 

 provinces. The primary regions are : 1. Palearctic, in- 

 cluding the whole of the Old World north of Sahara and 

 the Himalayas. 2. Ethiopian, including Africa south of 

 Sahara. 3. Oriental, including Asia south of the Hima- 



FlG. 335. — Map of the world, showing the six primary regions of Mr. 

 Wallace. 



layas, together with the adjacent islands, Ceylon, Java, 

 Borneo, Philippines, etc. 4. Australian, including Aus- 

 tralia, New Guinea, New Zealand, and Polynesia. 5. 

 Neotropic, including South America, Central America, 

 and the Antilles. 6. Nearctic, including all North Amer- 

 ica north of Mexico. These regions are shown on map 



(Fig- 335)- 



These are each subdivided into four provinces, as 



shown in the following schedule; but we will give more 



particularly only those of our own Nearctic region. 



