NEW MAMMALS FROM MEXICO 563 



large, broadly strap shaped or subquadrangular, but narrower on outer 

 sides than in middle. 



Aleastiremejits. — Type specimen ( $ old) : total length 303 mm. ; 

 tail 148 ; hind foot 28. Average of S adults of both sexes : total 

 length 297; tail 150; hind foot 27.5. 



OTOTYLOMYS PHYLLOTIS PH^^US subsp. nov. 



Type from Apazote, near Yohaltun, Campeche. No. 107940. 9 * 



ad. U. S. National Museum, Biological Survey Coll. December 



28, 1900. E. W. Nelson and E. A. Goldman. Orig. no. 14369. 



Characters. — Similar to O. phyllotis but somew^hat smaller; tail 



much smaller and shorter ; upperparts much darker, the posterior 



median dorsal region dusky, the sides and fore-back grayish brown 



with a pale dull fulvous tinge. Skull similar to that of phyllotis but 



slightly smaller ; rostrum more slender ; frontals and nasals flatter and 



in same plane (nasals not decurved) ; superciliary shelves not so 



strongly developed. 



Measurements. — Type specimen ( 9 ad.): total length 266 mm, ; 

 tail 136; hind foot 26.5. 



CALLOSPERMOPHILUS MADRENSIS sp. nov. 



Type from Sierra Madre, near Guadalupe y Calvo, Chihuahua, 

 Mexico (altitude 7,000 feet). No. 95363. 9 ad. U. S. National 

 Museum, Biological Survey Coll. August 27, 1S9S. E. W. Nel- 

 son and E. A. Goldman. Orig. no. 12923. 



Characters. — Similar to Callospermophilus lateralis^ but tail 

 about half as long. 



Color. — (In fall pelage) ground color above grizzled grayish, be- 

 coming dull grayish fulvous on rump; black stripes nearly obsolete ; 

 white stripes buffy gray, slightly grizzled with black hairs; fore and 

 hind feet whitish ; underparts soiled whitish more or less grizzled ; 

 tail above grizzled dull grayish fulvous and black, below yellowish. 

 Cranial characters. — Skull similar to that of lateralis., but ros- 

 trum less swollen. 



Measurements. — Type specimen ( 9 ad.) : total length 233 mm. ; 

 tail vertebrae 58 ; hind foot 39. Average of 8 females from type local- 

 ity ; total length 228 ; tail vertebrae 62 ; hind foot 39. 



