Osgood Thirty New Mice of the Genus Peromyscus. 67 



Peromyscus xenurus sp. nov. 



Type from Durango, Duningo, Mexico. Adult female, No. 94,518, U. S. 

 National Museum, Biological Survey Collection, July 1, 1898, E. VV. Nel 

 son and E. A. Goldman. 



Characters. Similar in size and proportions to P. melanoplmjs ; ground 

 color more nearly fawn than tawny ; pectoral spot well developed ; tail 

 black except a narrow ventral line of white; hind feet clouded with 

 dusky. 



Color. Type, in fresh pelage except on rump : Ground color of upper 

 parts grayish fawn color, gradually becoming more grayish anteriorly, so 

 that with the strong mixture of black through it all the effect from the 

 middle of the back forward passes from mixed fawn color through drab 

 to hair brown ; the rump, which is still in worn pelage, is fawn color; 

 lower cheeks bright fawn color blending with gray, which covers most of 

 the face from the base of the ears forward to the nose ; under parts white 

 except patch of bright fawn color extending from bases of forelegs across 

 breast ; hind feet clouded with dusky brown to base of toes, which are 

 creamy white ; tail black all around except a narrow stripe of white on the 

 under side occupying scarcely more than one-fifth of the entire surface of 

 the tail except distally, where, the diameter of the tail being very slight, 

 it nearly covers the under side. 



Skull. Similar in general to that of P. m. consobrinus ; nasals noticeably 

 shorter; anterior palatine foramina shorter; postpalatal notch shorter 

 and wider. 



Measurements. The type and one adult topotype : Total length, 246-248 ; 

 tail vertebrae, 142-140; hind foot, 28-28. Skull: Greatest length, 30 

 basilar length of Hensel, 23.8; zygomatic width, 115.5; interorbital 

 width, 4.9; nasals, 10.2; upper molar series, 4.9; palatine slits, 5.7 x 2.3. 



Remarks. This species is easily distinguished from any other of the 

 mdanophrys group by the combination of large pectoral spot, dusky hind 

 feet, and peculiar tail with only a narrow line of white on the under side 

 instead of the usual equal division of the light and dark. It is the north 

 ernmost form of the melanophrys group, and at present is only known from 

 two specimens from one locality, so there is doubtless much to be learned 

 in regard to its distribution. 



Peromyscus zelotes sp. nov. 



Type from Querendaro, Michoacan, Mexico. Old female, No. 50,430, 

 U. S. National Museum, Biological Survey Collection, August 8, 1892, 

 E. W. Nelson. 



Characters. Size about the same as P. levipes (hind foot, 23) ; tail 

 slightly longer than head and body ; ears relatively about same size as in 

 melanophrys ; color almost exactly as in P. melanophrys ; skull similar in 

 general to that of P. melanophrys but much smaller. 



