68 Osgood Thirty New Mice of the Genus Peromyscus. 



Color. Similar to that of P. rnelaiwphrys, but facial region more suffused 

 with tawny and the gray very much reduced; somewhat similar to 

 P. kvipes but paler throughout ; no trace of a pectoral spot. 



Skull. Similar in general to that of P. melanophrys but much smaller; 

 audital bullte slightly smaller ; nasals shorter, interorbital space relatively 

 wider; supraorbital beads obsolete; postpalatal notch narrow. 



Measurements. 'Ty\K (old $): Total length, 218; tail vertebrae, 115; 

 hind foot, 23. Skull: Greatest length, 28.3; basilar length of Hensel, 

 21.6; zygomatic width, 14.2; interorbital width, 4.9 ; nasals, 10.6; upper 

 molar series, 4.6 ; palatine slits, 5.6 x 2.4. 



Remarks. This species appears to be closely related cranially to 

 P. melanophrys, but differs markedly from the other forms of the group 

 in its small feet and short tail. It requires no serious comparison with 

 P. kvipes, which has a widely different skull, with low shallow brain- 

 case, posteriorly compressed nasals, small bullae, etc. Besides three from 

 the type locality, one rather imperfect specimen from Tula, Hidalgo, 

 seems referable to zelotes. It is somewhat brighter colored and differs 

 slightly in cranial characters. 



Peromyscus banderanus vicinior subsp. nov. 



Type from La Salada, Michoacan, Mexico. Adult male, No. 126,503, U. S. 

 National Museum, Biological Survey Collection, March 23, 1903, E. W. 

 Nelson and E. A. Goldman. 



Distribution. Known from three localities in the State of Michoacan to 

 the eastward of the range of typical P. banderanus. 



Characters. Darker than P. banderanus; skull narrower and anterior 

 palatine foramina differently shaped ; otherwise similar. 



Color. Slightly darker and more vinaceous than in banderanus in worn 

 or summer pelage ; decidedly darker in winter pelage, with a definite 

 dusky median dorsal area; markings about eyes, whiskers, and ankles, 

 sooty black instead of brown as in banderanus; upper side of tail sooty 

 instead of brownish. 



Skull. Similar to that of banderanus, but braincase averaging slightly 

 narrower ; anterior palatine foramina more nearly elliptical, being widest 

 in the middle and narrowing toward each end. 



Measurements. Type: Total length, 216; tail vertebrae, 107 ; hind foot, 

 27. Average of 3 young adults from La Huacana, Michoacan, 233 ; 117; 

 24.5. Skulls of two adults :* Greatest length, 31-32; basilar length of 

 Hensel, 23.3-24.1; zygomatic width, 14.3-14; interorbital width, 5-4.8; 

 nasals, 11.8-12.4; interparietal, 3.7 x 10. 2-4.5 x 10.2; upper molar series, 

 4.6-4.4 ; palatine slits, 6 x 2.3-5.8 x 2.3. 



Remarks. This is an interior form of banderanus, only slightly charac 

 terized but not entirely negligible. Two specimens taken in FebTuary at 

 Los Reyes, Michoacan, present the fullest and newest pelage and show a 



* Measurements mentioned first are those of the type. 



