154 Nelson New Squirrels from Mexico and Central America. 



and dingy rufous on under side of body. Ears and feet dark iron-gray. 

 2 upper premolars. 



Color. Dorsal surface from nose to base of tail, including tops of fore 

 and hind feet, excepting nape and rump patches, finely grizzled with 

 black and gray, the latter obscurely mixed with dull fulvous; gray of 

 crown, nape, and rump mostly replaced by fulvous, thus producing dis 

 tinct patches of dull dingy fulvous grizzled with black. Ears like nuchal 

 area, with distinct patch of white fur behind base ; chin dingy gray. 

 Lower surface, including inside of forelegs and thighs, dark dingy rufous. 

 Upper surface of tail black heavily washed with white; median band on 

 lower surface varying from grizzled black and pale fulvous gray to black 

 and rich buffy-fulvous ; with a heavy band of black on each side edged 

 externally with white. The tail has a remarkably broad full brush. 



Measurements. Type specimen : Total length 498 ; tail vertebrae 243 ; 

 hind foot 67. Average of five adults : Total length 514.2 ; tail vertebrae 

 256.8; hind foot 68. 



Sciurus aureogaster frumentor subsp. nov. Perote Squirrel. 



Type from Las Vigas, Vera Cruz, Mexico. No 54259, $ ad., U. S. Nat. 

 Mus., Biological Survey Coll. Collected June 18, 1893, by E. W. Nelson 

 and E. A. Goldman. Orig. No. 5073. 



Distribution. East slope of Cofre de Perote, Vera Cruz, Mexico, from 

 near Las Vigas (7500 ft.) to Jico and Jalapa (4400 ft.). 



Characters. Size of 8. aureogaster, from which typical specimens differ 

 in having very distinct ru/ous patches on nape and rump, and grizzled 

 gray lower surface. 2 upper premolars. 



Color. Summer pelage (Las Vigas) : Top of nose and fore part of crown 

 grizzled black and gray, sometimes slightly mixed with fulvous ; nape 

 and rump patches large and conspicuous, varying from dark orange-buffy 

 to dark ferruginous ; rest of back and sides, including tops of feet and 

 legs, grizzled black and gray, or black, gray, and orange-buffy, the gray 

 overlying the other colors. Tops of feet darker than back and usually 

 blackish, thinly grizzled with gray. Ears generally like nape patch, but 

 often grizzled with gray and sometimes with a whitish tuft behind base ; 

 narrow ring of dingy buffy round eye. Side of head between eye and 

 ear, up to border of nape patch in front of ear, dark, dingy orange-buffy. 

 Lower surface dingy grizzled black and gray nearly as on back, but paler 

 on chin, lower cheeks, throat, and breast. Base of tail all round like 

 rump. Upper surface of tail black, washed with white ; below with a 

 dark rufous median band broadly bordered on each side by black and 

 edged externally with white. 



Measurements. Type specimen : Total length 500 ; tail vertebrae 253 ; 

 hind foot 69. Average of 5 adults: Total length 504.6; tail vertebras 

 249.8; hind foot 68.6. 



Remarks. Winter pelage : Two specimens taken in April at Jalapa are 

 in winter pelage and differ from the large series of summer skins taken 

 at Las Vigas and Jico in the greater amount of gray on the dorsal surface. 



