CHAPTER VII 

 ORDER OF GNAWING ANIMALS 



GLIRES, OR RODENTS 



THE Order of Gnawing Animals contains a great many 

 species, and to persons who have not studied it with 

 some attention, it is a chaotic jumble of living creatures. 

 This unsatisfactory condition is entirely unnecessary. A few 

 hours' diligent study — under helpful conditions — will give any 

 intelligent person a fair knowledge of the chief subdivisions 

 of this Order, and an acquaintance with a sufficient number 

 of examples that each strange North American rodent met 

 with can be referred to its proper Family. 



The list of families, and the number of species recognized 

 in each by Dr. D. G. Elliot on July 1, 1905, is shown below r , 

 Since the date mentioned, a few additional forms have been 

 described. 



Order Glires, or Rodentia 

 (north of Panama) 



FULL SPECIES SUBSPECIES 

 NORTH AMERICAN FAMILIES IN 1905 IN 1905 



I. Squirrel Family Sci-u'ri-dae 125 124 



II. Sewellel Family Ap-lo-don'li-dae . . . 4 2 



III. Beaver Family Cas-tor'i-dae 1 3 



IV. Rats, Mice and Voles. .Mu'ri-dae 383 180 



V. Pocket Gophers Ge-o-my'i-dae 84 24 



VI. Kangaroo Rats Het-e-ro-my'i-dae 93 57 



VII. Jumping Mice Za-pod'i-dae 11 9 



ISO 



