124 GLIRES. 
red to creamy white, sometimes ringed with black. Tail black, generally 
washed with white, the hairs rufous, pale brown or whitish at their bases, each 
with one or two black or brown rings and a white tip. 
6. S. variabilis. Average length about 12”, of tail 11”. Pelage rather harsh 
and sparse, ears high and narrow. Upper parts red, either pure or more or 
less grizzled with black. Lower parts white, fulvous, or light rufous, sharply 
defined from the dorsal colouring. Tail black, washed with bright orange-red, 
often very bushy. 
7. 8. wstuans. Average length about 8-25, of tail 7-50. One upper premolar. 
Upper parts dull olive, the hairs dusky, minutely ringed with rufous or fulvous. 
Lower parts rufous, fulvous, greyish, or white. ‘Tail black, more or less 
washed with rufous or fulvous; the hairs brown, banded with black, and 
more or less broadly tipped with red or yellow. 
8. 8. deppei. Average length nearly 9", of tail 7°25. Two upper premolars. 
Upper parts dark olive, often darker along the middle of the back. Lower 
parts white, greyish white, or light fulvous. Tail black, lightly washed with 
white ; the hairs fulvous, with black bands and short pure white tips, 
9. 8. chrysurus. Average length about 5"-50, of tail 3°75. Two upper pre- 
molars. Upper parts dark olive, the hairs very minutely tipped with fulvous. 
Breast bright rufous, rest of lower parts like the upper, but paler. Tail 
nearly uniform with the back; the hairs reddish fulvous, barred with black 
and minutely tipped with pale yellow or white. 
Two or three of the other North-American Squirrels approach our regional boundary, 
if they do not actually cross it. Mr. Allen says that the western dudovicianus race of 
the Fox-Squirrel, S. niger, Linneus, “ doubtless ranges far into Mexico”*; but he adduces 
no evidence in support of his belief. SS. fossor, Peale, and S. aberti, Woodhouse, are 
species of limited range, inhabiting California and Arizona; but as yet there is no | 
record of their having been obtained in Mexico. 
1. Sciurus carolinensis. 
Sciurus carolinensis, Gmelin, Linn. Syst. Nat. i. p. 148 (1788, ex Pennant)’; Baird, Mamm. N. Am, 
p- 256°; Rep. U.S. Mex. Bound. Surv. ii. Mamm. p. 35°; de Saussure, Rev. et Mag. Zool. 
1861, p. 4*; Tomes, P. Z. S. 1861, p. 281°; Alston, P.Z.S. 1878, p. 658°. 
Sciurus carolinensis, var. yucatanensis, Allen, Mon. N.-Am. Rodent. p. 705‘; Bull. U.S. Geol. Surv. 
iv. p. 879°. 
Ardilla of Spanish Americans (common to all the other species). 
Hab. Norta America, from New Brunswick southwards’.—Muxico (de Saussure‘), 
* Mon. N.-Am. Rodent. p. 723. Cf. fra, p. 126. 
