in the Collection of the British Museum. 417 



Some of the North- American squirrels which have tufted 

 ears in winter are said to have smooth ears in summer ; but I 

 have not seen any specimens showing this pecuharity. Many 

 species^ indeed most, have a tvift of soft hairs at the outer base 

 of the ears, and the ears themselves are covered with short 

 close-pi'essed hairs; and this tuft may be more distinct at cer- 

 tain seasons. 



I. Large-sized, grey, 



* Lateral streak black, dorsal streak red. No. I. Sc. Alberti. 

 ** Lateral or dorsal streak none. No. 2. Sc, ciuereus. 



II. Middle-sized ; fur soft. 



* Lateral streak distinct, lead-coloured ; beneath white. Nos.3,4. 

 ** Lateral streak distinct, black ; beneath red. No. 5. 



*** Lateral streak none; beneath red. No. 6, 



I. Large-sized, grey. 

 * Lateral streak distinct, dorsal streak red. 



1. Sciurus Alberti. 



Sciurus dorsalis, Wood, Proc. A. N. S. Pliilad. 1852, vi. 110 (not Gray). 

 Sc. Alberti, Woodhouse, Pioc. A. N. S. Philad. 1852, v. 220 ; Sel';rave's 



Zool. Exped. 1853, p. 53, t.6; Audub. & Bach. Quad. N. Am. 1854, 



iii. t. 153. f. 1 ; S. Baird, M. N. A. 267. 



Fur finely grizzled black-grey and black ; beneath and feet 

 white ; a dark line on each side of the belly ; back with a pure 

 chestnut streak ; tail black and white mixed, beneath white ; 

 ears tufted. 



Hab. New Mexico, San Francisco Mountains (Dr. Wood- 

 house). Mus. Smithsonian Institution. 



See also Sc. castanonotuSj Baird, M. N. A. 266, t. 65. f. 81, 

 82. C. [castanotus). Similar, but with the ears without tufts. 

 Perhaps a Macroxus. 



■** Lateral or dorsal streak none. 



2. Sciurus cinereus. 



Sciurus cinereus, Linu., And. & Bach. Q. N. A. i. 145, t. 1/ ; Baird, M. N. 



A. 248, t. 48. f. 2. 

 Sc. vulpinus, Schreb. iv. t. 215 b. 

 Sc. virginianus, Kerr. 

 ISc. hy emails, Ord. 



Fur light grey above, beneath white ; head broad, muzzle 

 short; ears grey, short, scarcely longer than the adjacent fur, 

 never white, covered with hair and fringed with longer hairs. 



Hab. North America, Pennsylvania. B.M. 



