HETEROMYS. 



odom oooto 



Fig. 58. Heteromys alleni. 



No. 326S Field Columbian Museum Coll. Nat. fize. 



Lower tooth row. 

 Enlarged 7 times. 



Upper tooth row. 

 Enlarged 7 times. 



393. alleni. {Heteromxs), Coues, Bull. Mus. Comp. Zool., i88i, 

 viii, p. 187. 



Type locality. Hacienda Angostura, Rio Verde, Mexico. 



Geogr. Distr. Southern Mexico, northward to the mouth of the 

 Rio Grande in Texas. 



Genl. Char. Soles hairy, five tuberculated; tail long; pelage 

 coarse, with flattened spines intermixed in the hairs. Incisors 

 yellow. 



Color. Above blackish; the hairs having buff bases and tips 

 black, the lighter color showing amid the darker one. Lateral line 

 from nose to thighs bright buff; under parts white. Upper parts of 

 fore legs and thighs like back; feet white. Ears like back, lips white. 

 Tail bicolor, above black, beneath white. 



Measurements. Total length, 238-260; tail 1 15-136; hind foot, 

 28-30. 



Fam. VII. Zapodidae. 



E. A. Preble. Revision of the Jumping Mice of the genus Zapus. 

 N. Am. Faun., No. 15, 1899. 



"Super incisors compressed, sulcate; premolar small; molars 

 rooted, cervical vertebrae unanchylosed. Cranial portion of the 

 skull shorter and broader than in Muridce. Auditory bullse trans- 

 verse without special development. Anteorbital foramen large, 

 rounded, with a supplementary nick, or additional foramen at its 

 lower portion. Malar mounting the zygomatic process of maxillary 

 to effect suture with the lachrymal. Zygomatic arch styloid, much 

 depressed. Trunk enlarged posteriori}- in correlation with the short- 

 ness of the fore limbs, and great elongation of the hind ones, espe- 



