OF THE BEAVER AND OF SOME SQUIRRELS. 1193 



tarsal " pad has disappeared, altl:iougii the inner is somewhat 

 larger and more elongated than in S. carolinensis, and the whole 

 of the under side of the foot, including the digits, is covered 

 thickly with hair, apart from this pad, the well-developed four- 

 lobed plantar pad, and the digital pads. The latter are pointed 

 at their proximal ends. The fore foot is similarly hairy, there 

 being a distinct patch on the median area in front of the carpal 

 pads and defined by the three elongated contiguous lobes of the 

 plantar pad. I am not aware whether the soles of the feet in 

 this species are naked in the summer or not; but analogy justifies 

 the belief in this being so. (Text-figs. 49, A-0 ; 50, C, D.) 



In Sciurtis vulgaris * and its subspecies the lower sides of the 

 feet in summer are as naked as in tropical species, except that 

 perhaps a larger area of the heel is hairy. The inner metatarsal 

 pad is comparatively shoi't and set some distance behind the 

 plantar pad ; the outer is quite small and some distance in front 

 of the anterior end of the inner. But in winter the soles and 

 lower sides of the digits are overgrown with hair Avhich is more 

 abundant on the hind than the front foot. In the hind foot it 

 obliterates the metatarsal pads and passes between the lobes 

 of the plantar pads. In both feet at this season the digital pads 

 are reduced to long, narrow, posteriorly-pointed lobes. (Text- 

 fig. 50, A, B.) 



In the North American Red Squirrel, S. {Tamiasciurus) 

 hudsonicus, I can find no trace of either of the metatarsal pads. 

 According to 0. B. Ooryt the soles of the feet are "furred in 

 the winter." From this statement I should infer that they are 

 naked in the summer, were it not that a skin in the Zoological 

 Society's collection in summer pelage, with untufted ears and 

 black lateral stripe, has the metatarsus covered with hair almost 

 down to the plantar pads, whereas the area round the plantar 

 pads and the under sides of the digits are naked. The fore foot 

 also is as naked as in tropical species of Squirrels. On the 

 other hand, in the skin of a specimen that died on January 7th 

 in winter pelage, with tufted ears and no lateral stripe, both 

 fore and hind feet are covered with hairs beneath, as in the 

 specimen of the Fox Squirrel described, only the digital, plantar, 

 and carpal pads being naked. But Avhether the whole of the 

 metatarsal area in the American Red Squirrel is mesially naked 

 back to the heel in summer as in the' European Squirrel, 

 ^S'. vulgaris, I do not know. (Text-fig. 51, A, B.) 



d. Feet of the Chipping Squirrels (Tamias). 



The feet of the Chipmunk, Eutamias qtiadrivittatus, do not 

 differ materially from those of the typical Squirrels, except that 

 the third and fourth digits are very nearly equal, the fourth at 



* The feet, in summer and winter pelage, of tlie British representative 

 is. leucourus) of the species are figured and described by Barrett-Hamilton and 

 Hinton ('A History of British Mammals,' pt. xxi. p. 699, pi. xxxvii.). 



t ' The Mammals of Illinois and Wisconsin,' 1912, p. 123. 



