1899.] NATURAL SCIENCES OF PHILADELPHIA. 279 



slightly more iuflated than in the other members of the cinereo- 

 argenteus gronp. 



Color. — Type specimen in unworn winter coat. Quality of fur 

 and arrangement of color bands as in U. parvidens and the other 

 members of the genus. Dorsal surface clear gray formed by the 

 nearly equal mixture of the black tips and white sublerminal rings 

 of the coarse hairs. Under fur pale creambuff, appearing at 

 surface only when hair is disarranged. Top of head tinged with 

 tawny. On the sides the black tips are less conspicuous than on 

 the back, and the buff of the under fur appears distinctly at the 

 surface. Belly ochraceous buff except along median line and 

 betAveen hind legs, where it is dull white. Base of ear and area 

 behind ear tawny ochraceous; this area extending back to front 

 leg, but much suffused with gray except on and close to ear. 

 Distal half of ear thickly sprinkled with dusky hairs which consid- 

 eralily dull the oshraceous. Inner surface of ear whitish. Muzzle, 

 upper lip and chin dark brown. Cheek between eye and lip, and 

 region beneath the ochraceous area under ear dull white, 

 continuous Avith Avhite of throat. Dorsum of manus and pes 

 a coarse dark grizzle of black, white and tawny. Inner side 

 of hind leg white; outer and posterior side dull ochraceous. Palms 

 and soles dull ochraceous. The gray of the sides of the belly 

 extends down the front of the fore leg to join the gray of the foot. 

 Outer surface of foreleg dull ochraceous. Tail gray heavily shaded 

 with black. A broad, black dorsal stripe and conspicuous black 

 tip. Under side of tail dull ochraceous. Specimens in Avoru 

 pelage are less gray than the type, and the tawny areas are brighter 

 and more extensive. 



Skull — The skull of Uroeyon guatemalce closely reseml)les that 

 of U. littoralis, but averages slightly larger. It is much smaller, 

 however, than that of the ordinary gray fox of Mexico north of 

 the Isthmus of Tehuantepec. Zygomata slightly less flaring than 

 in U. littoralis. Audital bullre slightly larger and closer together 

 than in U. littoralis, their longitudinal diameter greater relatively 

 to their transverse diameter. The Avhole surface of the bulla is 

 more evenly rounded than in other members of the cinereoargenteus 

 group; in this respect showing an approach to U. jrater cuius and 

 U. parvidens. Compared with that of U. parvidens the skull of 



