SOME PALKARCTIC BEARS. 87 



and " Danis," and differs from '^ Arcticooiics" ( = Selenarctos*), 

 Tremarctos, Helarctos^ &g. The sti-acture of the anterior portion 

 of the fora feet of jjruinosus is, however, very different from 

 that of Ursus, because the interspaces between the digital pads 

 are hairy in the latter ; in fact, the digital pads of Ursus are 

 entirely surrounded by hair, because the naked strips between 

 the digital pads and the plantar pad are so exceedingly narrow 

 that they are even difficult to find when one is looking for 

 them ; still less are they plainly visible like those between the 

 digital pads of the first and fifth fingers on one hand and the 

 plantar pad on the other, as is described above, in the case of 

 pruinosus. With regard to this latter detail, the anterior portion 

 of the fore feet somewhat resembles the corresponding parts of 

 thibetanus (as figured by Pocock, 1914), but the digital pads of the 

 latter are much more distinct and free from each other than in 

 the pruinosus. 



The structure of the fore feet of Euarctos is essentially similar 

 to that of Ursus (at least in a specimen of the Alaska race 

 which I have had for comparison), and it differs thus in the same 

 way from pruinosus. The fore feet of the Grizzly Bears appear, 

 to judge from Pocock's description, to differ from those of Ursics 

 in having the digital pads more connected with each other and 

 without hair between them, in which respect they resemble those 

 of ^jruMJosits. In Pocock's figure (1918) of the " right fore foot 

 of Danis horrihilis " there are not to be seen any naked tracts 

 connecting the first and fifth digital pads with the plantar pad, 

 which is so characteristic for the fore feet of the p)'>^uinosus. The 

 latter appears thus to difier from "• Danis" as well as from the 

 other Bears with I'egard to the structure of its fore feet. 



The digital pads of the hind feet of our pruinosus are quite 

 fused together basally, although the notch between the first and 

 second toe is deeper than the others. They are not at all sepa- 

 rated from each other by hairy tracts. The first and fifth digital 

 pads are broadly connected with the plantar pad by means of a 

 naked area (in the same manner as on the foi'e feet). Between the 

 three middle toes and the plantar pad is a transverse area thickly 

 covered with hair. If these hairs are divided with the aid of a 

 pair of pincers, there is, however, to be seen a naked strip of skin 

 connecting also these digital pads with the plantar one, although 

 this is not visible without such a proceeding (cf. PI. I. figs. 3 

 & 4). The plantar surface is naked to the heel, and there is no 

 notch or depression covered Avith hair on the hallucal side, only a 

 slight superficial crease indicating the limit between plantar and 

 heel pads. In the absence of this hairy depression on the hallucal 

 side, tlie hind foot of the j^ruinostis differs from Ursu.s and Euarctos. 

 Both these genera are also different from pruinosus in having the 



* Sowerbj^ has drawn attention to the fact that Heude ah'eady (1901) gave the 

 name Selenarctos to an assemblage of Black Bears, among which also tliihetanus is 

 found ; and Sowevby, as " first reviser " of the group, selects this one as the t3'pe for 

 Heude's genus [of. Journ. Mamm. 1920, pp. 216-17). 



