THE ORIENTAL REGION 131 



of itself, is practically confined to the Region, although it has 

 slightly overstepped its boundaries, being said to occur in 

 one of the smaller Austro- Malayan islands between Sumba 

 and Timor. Besides the Lemurs, six genera of true Monkeys 

 are found in the Oriental Region. Three of these, the 

 Proboscis Monkey of Borneo (Naaalis), the Gibbons (Hylo- 

 bates), and the Orangs of Sumatra and Borneo (Simia), are 

 strictly endemic ; while the other three, although highly 

 characteristic of this Region, have extended their range 

 slightly across its frontiers. 



Summarizing these results, we shall find that the 

 Oriental Region contains only two truly endemic and one 

 quasi-endemic families out of a total of thirty-six which 

 occur within its limits. These are the Galeopithecid& 

 (Flying Lemurs), Twpaiidse (Tree shrews), and Tarsiidte 

 (Tarsiers). 



The total number of genera found in the Region is 

 113, out of which 38 are peculiar; 11 extend their ranges 

 slightly beyond the limits of the Region, and 64 are widely 

 spread. On reducing these figures to an average, it will 

 be found that the Oriental Region contains about 38 per 

 cent, of peculiar genera, or, if the quasi-endemic genera be 

 added, about 45 per cent. In either case, this shows a 

 much lower percentage of peculiarities than has been 

 shown to exist in the three Regions previously considered. 



Section III. — Subdivision of the Oriental Region 



The Oriental Region, as regards its mammals, may be 

 most conveniently divided into four Sub-regions (see Map, 

 Plate V., p. 152). These are :— 



1. The Indian Sub-region. — This comprises the whole 



