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DISTRIBUTION OF RODENTS (continued).

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81. Megalomys 82. Ligmodon 83. Oryzomys 84. Chilomys. 85. Reithrodontomys 86. Eligmodontia 87. Nectomys. 88. Neotomys 89. Reithrodon 90. Phyllotis . 91. Scapteromys. 92. Ichthyomys 93. Acodon 94. Oxymycterus 95. Blarinomys 96. Notiomys. 97. Neotoma 98. Nelsonia 99. Xenomys. 100. Hodomys. 101. Phenacomys. 102. Evotomys 103. Microtus (Arvicola) 104. Synaptomys. 105. Lemmus (Myodes). 106. Dicrostonyx . 107. Ellobius 108. Siphneus 109, Fiber

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DISTRIBUTION OF RODENTS (continued).

Total Species.

I. Australian

Region.
II. Neotropical

Region.
III. Ethiopian

Region.
IIIa. Malagasy

Region
IV. Oriental

Region.
V. Nearctic

Region.
VI. Palxarctic

Region.

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FAMILY XIII. OCTODONTIDÆ. 131. Ctenodactylus

1 132. Massoutiera

2 133. Pectinator

1 134. Petromys.

1 135. Ctenomys.

9 136. Acondemys (Schizodon) 1 137. Spalacopus

1 138. Octodon

4 139. Habrocoma

2 140. Dactylomys

1 141. Thrinacodus.

1 142. Cannabatomys

1 143. Loncheres

18 144. Trichomys

4 145. Cercomys.

1 146. Carterodon

1 147. Mesomys.

4 148. Echinomys

13 149. Myocastor

1 150. Capromys

5 151. Plagiodontia

1 152. Thryonomys (Aulacodus).

4

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DEDUCTIONS

1. The Order Rodentia is the most numerous of all the chief Mammalian groups, containing nearly 1400 species, which are divided into 170 genera and 21 families.

2. The Rodents are distributed all over the world both in temperate and tropical climes, and are abundant everywhere, both in species and individuals, except in Australia where they are poorly represented.

3. The most all-pervading and numerous family of the Rodents is the Muridæ (Mice), which are upwards of 600 in number and are the only members of the group met with in Australia and Madagascar. In Madagascar the Muridæ are represented by a small group of indigenous genera.

4. The Porcupine-like Rodents, of which there are seven families, are specially characteristic of the New World, only the typical Porcupines (Hystricidx) and tive peculiar genera of Octodonts being inhabitants of the New World.

5. Two families of Rodents, the Pocket-gophers (Geomyidx) and the Kangaroo-rats (Heteromyidæ), are specially characteristic of the Nearctic Region, the Jerboas (Dipodida) of the Palæarctic, and the Sand-rats (Bathyergidx) of the Ethiopian Region.

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