88 NEARCTIC AND ORIENTAL REGIONS chap. 



patus, Sigmodon. On the other hand, the Sonoran genera Antilo- 

 v.aimi, Cynomys, Procyon, and the Insectivora Marina and Scajianios, 

 extend further north. Peculiar to this region are only six genera 

 of Eodents, which seems an. insufficient reason for raising the 

 Sonoran province to the dignity of a region. Considered from the 

 point of view of numbers of peculiar forms, the Thibetan subregion 

 has more claims to distinction as a region ; for confined to that area 

 we have the genera Nectogale, Aehiropus, Eu^Ktanrus, Pantholo2ys, 

 Budorcas ; while by slightly extending its limits, a number of 

 other peculiar forms might be added. Madagascar has distinctly 

 more claims to regional division. Absolutely confined to it are 

 eleven of the seventeen existing genera of Lemurs, the family 

 Centetidae among the Insectivora, which contains seven genera, 

 and another recently discovered and peculiar genus, Geogale ; it 

 has six peculiar genera of Viverridae ; it has ti\'o peculiar genera 

 of Eodents. In addition to this it is negatively characterised 

 by the absence of the following typical African animals, Felidae, 

 Proboscidea, Ehinocerotidae, Equidae, Monkeys, etc. It seems 

 to be impossible to avoid allowing the rank (.)f a, region to this 

 part of the world. 



In separating the Nearctic from the Palaearctic region, stress 

 must be laid rather upon the absence of Asiatic and European forms 

 from JSTorth America than upon the existence in the northern half 

 of the New AVorld of many peculiar forms. Peculiar to the Nearctic 

 are the Goat genus Haj^loceros, the Eodents JErethizon, Zaints, and 

 the family Haplodontidae. The Mole genus Condylura is also 

 restricted to this part of the New ^Vorld. Even so it has more 

 peculiar forms than the )Sonorau. If we add tn this the absence 

 of Horses, Antelopes except Antilocapra, Pigs, Hyaenas, etc., there 

 are strong grounds for retaining this division. It must be 

 agreed, however, that it comes rather nearer to the Eurasian 

 district than the latter does to the Oriental. 



The Oriental region has many characteristic animals. It has 

 among the Anthropoid Apes the Orangs and Gibbons; of Old World 

 Apes it has confined to its own area the genera SemiuijutheMis 

 and Nasalis. Of Lemurs there are Loris and Nyrticchus, and 

 Tarsius, representing a family of that order, or even a sub-order. 

 The Galeopithecidae are entirely Malayan. There are many 

 Eodent, Carnivorous, and Insectivorous genera ; the Ehinoeeroses 

 and the Elephant of this region differ from those of Africa. 



