750 



MONOGRAPHS OF NORTn AMERICAN RODENTIA. 



Table XLVL— List of specimens examined of SCIDRUS HYPOPYItltHl S. 



*In Museum of Comparative Zoology, Cambridge, Mass. 



SCIURUS AUREIGASTER F. Cuvier. 



Rcd-bcllled Squirrel. 



Sciurus aureogaster F. Cuvif.r, Hist, des Maui, iii, livr. lix, 1829 (with a figure). — Bachman, Charleswortb's 

 Mag. Nat. Hist, iii, 1838, 158.— Wacner, Suppl. Scbreber's Sanget. iii, 1843, 165.— Scmxz, 

 Synop. Mam. 1845, 7.— Baird, Mam. N. Am. 1857, 282 (from Cuvier).— Gray, Anu. and Mag. 

 Nat. Hist. 3d ser. xx, 1867, 423. 



t "Sciurus kucogaster F. Cuvier, Mam. i, 1831, 300." 



Sciurus fcmiginiventrti Audubon & Bachman, Proc. Acad. Nat. Sci. Fbila. 1841, 101 ; Journ. Acad. Nat. 

 Se.i. Phila. viii, 1842, 313; Quad. N. Am. i, 1849, 292, pi. xxxviii — Baird, Mam. N. Am. 1H57, 

 281 (from Audubon and Bacbman). 



Macroxus aureogaster Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 423. 



Macroxus morio Gray', Anu. and Mag. Nat. Hist. 3d ser. xx, 1H67, 424. 



FaiiiiuU dc la Calif ornie on a ventre dori, F. Cuvier, Hist, des Mam. iii, livr. lix, 1829. 



Specific chars. — Head and body about 10.50; tail- vertebrae 8.50 to 9.00; 

 tail to end of hairs about 11.50, rather longer than head and body. Pelage soft 

 and full. Above, including the head, clear dark gray ; beneath, deep reddish- 

 orange, which blends with the gray of the sides, and often extends high up on 

 the sides at the shoulders, sometimes meeting on the back, where, however, it 

 is generally more or less mixed with gray. Sides of the head and chin light 

 gray. Tail tricolored below, centrally deep reddish-orange, then black, and 

 white-edged; upper surface mixed black and white. 



The color varies greatly in different individuals, but less so than in most 

 of the other Mexican Squirrels, the chief variation being in the direction of 

 melanism. The gray, however, varies from whitish-gray to dark iron-gray, 



