APR. 1903. NEW SPECIES AND SUBSPECIES OF MAMMALS ELLIOT. 161 



chin and patch on upper part of throat pure white, rest of throat 

 plumbeous washed with white; inside of fore legs and narrow line 

 across breast below the plumbeous on throat deep ochraceous; 

 below this line on breast is a pure white patch, and another on 

 anal region; center of abdomen buff, rest of under parts plum- 

 beous washed with white; outer side of hind legs black to ankles, 

 the black extending onto the back of ankles; feet and hands pure 

 white; tail above blackish with a white *tip 43 millimeters in 

 length, beneath ochraceous at base, this color extending in a thin 

 line on the center of the tail for half its length; rest of under 

 surface pure white. 



Measurements. Total length, 423; tail vertebrae, 202; hind 

 foot, 47; ear, 32. Skull: occipito-nasal length, 51; Hensel, 43; 

 zygomatic width, 27; interorbital constriction, 5; length of nasals, 

 20; palatal arch to the alveolus of incisor, 24; length of upper 

 tooth row, 9.5; length of mandible, angle to alveolus of incisor, 

 25; height at condyle, 10.5; at coronoid process, 15. 



This wood rat, while evidently a subspecies of N. fusca, has 

 also some resemblance to N. c. occidentalis, in the pure white of 

 a part of the under surface of the tail, but the upper surface, 

 while brighter than that of N. fusca, has none of the rufous tinge 

 seen in the tail of N. c. occidentalis. The pure white tip, how- 

 ever, makes this form conspicuously distinct from all the wood 

 rats know-n to me. A series of this subspecies was secured at 

 Gardiner. 



GENUS MICROTUS. 

 Microtus californicus *huperuthrus. Sp. nov. 



Type locality. San Quentin, Lower California. 



Geogr. distr. Sea coast in the vicinity of San Quentin up to 

 8,000 feet elevation, in the San Pedro Martir mountains, Lower 

 California, Mexico. 



Gen. char. Larger and usually more reddish in color than 

 M. californicus, with hind foot longer and tail about equal. 



Color. Upper parts dark tawny, or tawny ochraceous slightly 

 lined with black; sides paler, more buffy; entire under parts 

 plumbeous, faintly washed with white; hands and feet gray; tail 

 above dusky, beneath grayish white. 



Measurements. Total length, 208; tail vertebrae, 54; hind foot, 

 24.5; ear, 18. Skull: occipito-nasal length, 33; Hensel, 29; 

 zygomatic width, 19; interorbital constriction, 3; length of nasals 



*virpv r Jpo?, reddish. 



