SOME PALEARCTIC BEAES. 91 



teeth mentioned is about equal to half the mastoid breadth, or 

 perhaps hardly that, but in the pruinosus group the former 

 measurement is about from 56 to 60 per cent, of the latter. 



In consequence of the great size of the mandibular teeth 

 and the resulting great length of the tooth series in pruinostis, 

 mg has been pushed backward, so to speak, so that the posterior 

 portion of the same is concealed hy the p7'0cessus coro7ioideics when 

 viewed from the side. This characteristic, which also has been 

 observed and mentioned by Leche when he described the mammals 

 brought home from Thibet by Dr. Sven Hedin (I. c.),, serves easily to 

 recognize a mandible of the pruinosus group, because in the now 

 li^'ing Bears of the arctos group, in^ is in its whole extent visible 

 in front of the processus coronoideus. 



Of the Grizzly Bears, I have unfortunately no material for 

 comparison, but with regard to the skull of a fossil Cave Bear 

 I have had the opportunity of stating that it exhibits the same 

 relative dimensions as the recent arctos in the cases mentioned 

 above. Thus the combined length of ^/, ?ft\ and m^ is shorter 

 than the distance between m^ and the processus postglenoideus, 

 and likewise the former dimension is shorter than the preorbital 

 width and less than half the mastoid breadth. The combined 

 length of p^, 7?ij, m^, and 7n^ of the same skull is even contained 

 4| times in the length of the palate, and is less than half the 

 mastoid breadth. 



In consequence of these facts, I am inclined to consider that the 

 Bears of the pi'uinosiLS group (whether it consists of only one or 

 more species or subspecies) are so different from other Bears that 

 they are entitled to subgeneric rank. This new subgenus I 

 propose to call Mylar ctos ; it is chai'acterized by its -varj large 

 molariform teeth and foot structure, as described above. 



Ursus lasiotus Gray. 



A fine, big male Bear, procured in JSTorthern Mongolia by the 

 Swedish missionary, Mr. Larsson, and through the courtesy of 

 Professor J. G. Andersson presented to the Stockholm Museum, 

 must, according to my opinion, be named as above. It agrees with 

 Gray's short description, being black with brown nose and some- 

 what brownish on the head in front of the ears, in consequence of 

 such tips to the hairs. The ears agree with the specific name, 

 being richly covered with long black hairs as well inside as outside. 

 On the sides of the neck there is in some shades of light a faint 

 chestnut-reddish lustre. The under-fur is well developicd and 

 dark brown. The claws blackish horn-coloured. In a mounted 

 state the specimen stands a little more than 1 m. at the fore 

 quarters. 



Gray's name (lasiotus) of 1867 has by later authors been more or 

 less discarded. Even in 1869 Sclater identified Gray's Bear 

 with IT, piscator Pucheran, which latter name referred to a 

 Bear from Kamtschatka. It is true "that not much is known 

 concerning Gray's lasiotus. It w^as "imported from JSTorthern 



