82 Goldman Descriptions of Five New Mammals from Mexico. 



to that of iV. tenuicauda, but nasals longer and narrower and premaxillae 

 longer. 



Color. Upper parts dark brown, becoming brownish fulvous on cheeks, 

 shoulders, and along sides, this color encroaching on under parts poste 

 riorly, leaving a narrow, whitish area along the median line of the belly ; 

 rest of under parts, except a salmon colored band across pectoral region 

 in the type, dull whitish (the plumbeous basal color showing through) ; 

 ears faintly edged with whitish ; tail nearly unicolor, dusky above, 

 slightly paler below; fore and hind feet clouded with dusky, the toes of 

 hind feet whitish. 



Skull. Somewhat like that of A 7 , tenuicauda, but nasals more wedge- 

 shaped, much longer and narrower, reaching plane of lachrymals ; ascend 

 ing branches of premaxillae very long, reaching beyond plane of lach 

 rymals; frontal region broader and flatter posteriorly; teeth smaller. 

 Compared with that of N. parvidens, the skull is larger and flatter, 

 braincase larger and more smoothly rounded ; nasals and ascending 

 branches of premaxillae longer ; teeth larger. 



Measurements. Type: Total length, 325; tail vertebrae, 156; hind foot, 

 34. Skull of type : Greatest length, 41.3 ; basilar length of Hensel, 33 5 ; 

 zygomatic breadth, 22.2; length of nasal*, 16.5; interorbital breadth, 

 5.8; palatal length, 7.9; diastema, 11.2; upper molar series on alveolus, 

 8.3. 



Specimens examined. Two, from the type locality. 



Liomys parviceps sp. nov. 



Type from La Salada, 40 miles south of Uruapan, Michoacan, Mexico. 

 Adult female, No. 126,477, U. S. National Museum, Biological Survey 

 Collection, March 19, 1903, E. W. Nelson and E. A. Goldman. Original 

 number 16,194. 



Characters. Size very small; color reddish; tail of moderate length. 

 Similar to L. plantinarensis but less fulvous ; skull smaller; tail slightly 

 longer; hind foot shorter, 6- instead of 5-tuberculate. 



Color. Upper parts grizzled brownish fulvous ; under parts, fore and 

 hind feet, white; fulvous lateral line rather faint; ears edged with 

 whitish ; tail distinctly bicolor, brownish above, whitish below. 



Skull. Smallest of the known species of the genus. Similar to that of 

 L. plantinarensis, but smaller and flatter ; braincase less expanded ; inter- 

 parietal smaller; rostrum less decurved ; nasals more arched anteriorly, 

 notched posteriorly as in L. plantinarensis. 



Measurements. Type: Total length, 202; tail vertebrae, 110; hind foot, 

 24. Average of five adult males and females from the type locality: 

 Total length, 204 (197-214); tail vertebrae, 105 (102-110); hind foot, 24 

 (24). Skull of type : Greatest length, 28.3 ; basilar length of Hensel, 20 ; 

 zygomatic breadth, 13; length of nasals, 11.5; interorbital breadth, 6.7; 

 interparietal, 3.2 x 8.3; upper molar series on alveolus, 4.2. 



Specimens examined. Total number, 16, from the following localities: 

 La Salada, Michoacan (type locality), 11; Rio Balsas, Guerrero, 5. 



