EXTERNAL FEATURES 15 



heavy brush and to some extent in trees, the foot is definitely 

 longer, with the toes long and slender. Teonoma, spending 

 much of its life climbing among the rocks, has a foot pro- 

 portionately the same length as the last, but the feet and 

 toes are much heavier and broader. The same conditions 

 are found in the fore feet of the three animals. 



Appendageous and integumentary characters 



The moderately dense hair upon the sole of the pes ex- 

 tends in appreciable amount only as far forward as the rear- 

 most pad. This hair is most scanty in Homodontomys and 

 is dark sooty; in Neotoma it is slightly more abundant and 

 white in color; while although still short, it is in much greater 

 abundance in Teorioma, and of a buffy shade. There is 

 an anterior and a posterior central pad or tubercle, while 

 four others are situated two mediad and two laterad, one 

 pair in front of the other, making six pads in all. There 

 are five toes, the hallux being small as usual, while the other 

 four are larger and well formed, and all five are furnished 

 with claws. 



The manus is also moderately hairy as far forward as the 

 rear pad. Of the latter there are two mediad and two 

 craniad, one pair in front of the other, and craniad to this 

 is a central anterior pad. There are four well formed 

 digits furnished with nails, but the pollex is rudimentary and 

 without a nail — a mere nubbin upon the side of the foot. 



The region of the external nares is not peculiar, and the 

 rhinarimn is of the typical murid form. As might be ex- 

 pected, the parts are more heavily haired in Teonoma. 

 The labio-nasal sulcus of the upper lip is moderate, but 

 can not be considered as well developed. 



There is so little actual disparity in the size of the ear in 

 the three subgenera that it is impossible to draw any con- 

 clusions regarding the slight relative differences existing. 

 The length of ear, measured from the notch, is in Homo- 



