DISTRIBUTION OF MAMMALS. 233 



(spiny rats) ; two p.g. of Cercolabidce (tree porcupines) . Solenodpn (a hedgehog-like form 

 from Cuba and Hay ti). Twenty-six p.g. of bats, including the Vampires. Five p.g. of Canidce; 

 three p.g. of Mustelidce; Nasua (coati) and Cercoleptes (Kinkajou) ; Tremarctos 

 (spectacled bear) ; Otaria (an eared seal). 



Peculiar Species. Among these are, twenty species of Didelphys (to which genus most 

 opossums belong). The American tapir. A species of racoon (genus Procyon)- 



Absent Forms. Ungulata are scarce, deer and llamas being the only ruminants, tapirs 

 and peccaries the only non-ruminants. The only insectivores are Solenodon and a 

 species of shrew (Sorex). The Viverridce are absent. 



VI. Nearctic Region. Thirty-two families are represented, of which one is peculiar, while 

 one other is almost so, i.e. Haploodontidce (rat-like forms allied to beavers and marmots), 

 and Saccomyidce (the pouched rats, of which one genus ranges into the N. of the Neo- 

 tropical region). 



Peculiar Genera (besides those in the above families). Antilocapra (prong-horned 

 antelope), Aplocerus (a goat-like antelope), and Ovibos (the musk-sheep). Three p.g. of 

 Muridoe, Jaculus (a jerboa) , Cynomys (the so-called prairie dog), and Erethizon (the 

 tree porcupine), three p.g. of moles, two p.g. of bats, two p.g. of Mustelidce; Eumetopias 

 (an eared seal ; Halicyon (a seal). 



Peculiar Species. Among these are two of Didelphys, a peccary, several deer, the 

 American bison, racoons, and the grizzly bear (Ursus ferox). 



Absent Forms. Ungulates are ill represented, deer, the American bison, two antelopes, 

 a sheep, and the musk-sheep, being the only ruminants, while a peccary (Texas to Red 

 River), is the only non-ruminant. Hedgehogs, Viverridce, and monkeys are all unre- 

 presented. 



