Goldman — New Mammals from North and Middle America. Ill 



Remarks. — The tawny suffusion of the flanks is variable in the Pinacate 

 desert mouse, some examples exhibiting more of this tone than others; 

 but the dark vinaceous-buffy general coloration of the upperparts is con- 

 stant in the series of specimens available and sufficiently distinguishes the 

 animal from P. e. anthonyi which is widely distributed in the region to 

 the eastward and southward. Although the two differ rather strikingly 

 in color they seem identical in size and cranial details and it seems ad- 

 visable to treat the present form as a subspecies. Its peculiar color is 

 paralleled by that of Neotoma albigula sheldoni from the same region, 

 these locally associated subspecies representing different subfamilies which 

 have yielded to similar environmental conditions. It is noteworthy, 

 however, that specimens of Perognatus baileyi Merriam taken at the same 

 locality and at the same time present no appreciable departure from the 

 typical form. The discovery of the Pinacate desert mouse is one of the 

 results of three expeditions to Sonora conducted by the hunter-naturalist 

 Mr. Sheldon, each of which has added materially to our knowledge of the 

 mammals of that interesting region. 



Specimens examined. — 12, all from the type locality. 



Neotoma cinerea lucida, subsp. nov. 



NEVADA BUSHY-TAILED WOOD RAT. 



Type from Charleston Peak, Charleston Mountains, Nevada. No. 

 208,968, $ adult, U. S. National Museum (Biological Survey collection), 

 collected by Luther J. Goldman, July 1, 1915. Original number 2282. 



General characters. — Size smallest and color among the palest of the 

 known forms of Neotoma cinerea. Most closely allied to Neotoma cinerea 

 cinerea, but decidedly smaller and paler; skull differing in detail, but 

 sphenopalatine vacuities absent as in TV. c. cinerea. Similar in color to 

 TV. c. arizonse and TV. c. rupicola, but size smaller and skulls distinguished 

 by absence of sphenopalatine vacuities present in those forms. 



Color. — Upperparts between light buff and light ochraceous-buff, rather 

 sparingly lined over top of head and back with black-tipped hairs ; mid- 

 dle of face, sides of muzzle, cheeks and outer sides of limbs buffy grayish; 

 underparts and feet white ; ears clothed with mixed grayish and pale 

 brownish hairs; tail grayish above, white below, except near base, which 

 is more or less distinctly buffy all around. Young (in first pelage) : Up- 

 perparts near pallid neutral gray, the back somewhat darkened by black- 

 tipped hairs ; tail very pale grayish above, edged with pure white. 



Skull. — Decidedly smaller than those of the other forms of TV. cinerea, 

 with zygomata relatively broader anteriorly and narrower posteriorly, the 

 sides therefore more nearly parallel ; frontal region flatter, less depressed 

 along median line; sphenopalatine vacuities absent as in TV. c. cinerea. 



Measurements. — Type: Total length, 324; tail vertebrae, 131 ; hind foot, 

 39. Average of three adult females, including type: 335 (324-352); 134 

 ( 130-141) ; 39.5 (39-40). Skull (type) : Greatest length, 45.4; zygomatic 

 breadth, 24; interorbital breadth, 5.5; length of nasals, 17.6; length of 

 anterior palatine foramina, 9.9; length of palatal bridge, 7.9; maxillary 

 toothrow, 9.1. 



