76 THE GEOGRAPHY OF MAMMALS 



all the twenty-four species of Opossums known from the 

 New World are found within its limits. The peculiarly 

 modified Water-opossum (Chironectes) occurs all over its 

 area, but also extends into the Central-American Sub- 

 region. 



Among the Edentates the Sloths are the most 

 characteristic inhabitants of its forests. But two peculiar 

 genera of Armadilloes (Xenurus and Priodon) are confined 

 to this Sub-region, and several other species of this group 

 occur there. All three genera of Ant-eaters are also here 

 met with. 



Rodents are very abundant in this Sub-region, but, 

 with the exception of Squirrels (Sciurus), Vesper-mice 

 (Hesperomys), Pouched mice (Heteromys), and a single 

 Hare (Lepus), they all belong to the Hystricomorphine 

 group, which is so highly developed in the Neotropical 

 Region. 



The Guiano-Brazilian Sub-region is also the special home 

 of the Phyllostomine bats. Out of a total of about sixty- 

 five species of this family forty-four are found in this 

 Sub-region, and the greater number of them are confined 

 to it. Such, too, is the case with the Platyrrhine monkeys. 

 The Marmosets (Ha/palidse) would be also unknown out- 

 side the limits of the Sub-region had not a single species, 

 as already mentioned, overstepped the northern boundary 

 at Panama. The Capuchins (Cebidse), numbering more 

 than sixty species and belonging to ten genera, are 

 likewise abundant, and are found elsewhere only in the 

 Central- American Sub-region. 



The following table shows at a glance the numbers of 

 (1) the " Endemic " genera of this Sub-region, i.e. those not 

 found beyond its limits ; (2) the " Neotropical " genera, i.e. 



