12 ARKIV FÖR ZOOLOGI. BAND 14. NIO 20. 



Baeza has so very much larger teeth than the Peruvian one. 

 This difference is so great that the two specimens must be 

 regarded as racially different. 



The type of T. o. majori has all dimensions of the skull 

 itself larger than the corresponding ones of the male Bear 

 from Baeza. It is then the more astonishing to find that 

 the latter has considerably larger teeth, especially in the 

 upper jaw, than the type of T. o. majori. That the Baeza 

 Bears really are large-toothed is further proved by comparing 

 the size of the teeth of the female with those of other 

 spectacled Bears. The female Bear from Baeza has consider- 

 ably larger molars and premolars than the male Peruvian 

 Bear, and its premolars and molars of the upper jaw are as 

 large, or in some cases even larger, than the corresponding 

 ones of the male T. o. majori. 



The female Bear from Gualea is smaller in all dimensions 

 of its skull, and also with regard to the teeth than the fe- 

 male Bear from Baeza. It may therefore be similar to the 

 typical T. ornatus. It is thus quite evident that the Bears 

 inhabiting the western slopes of the Andes at Gualea are 

 quite different from those living on the eastern side of the 

 mountain chain at Baeza. The latter are larger and with 

 larger teeth in this respect resembling or even exceeding 

 T. o. majori Thomas. They are evidently more related to 

 the latter than to the typical T. ornatus and considering the 

 variability among the Bears generally, I am inclined to re- 

 gard the Bears of Baeza as representing the subspecies men- 

 tioned. The type locality of T. o. majori, the province of 

 Azuay, is situated on the eastern slopes of the Andes as 

 well and it appears probable, that the large and large-toothed 

 race belongs to the eastern slopes, while the smaller T. orna- 

 tus lives on the western side. The province mentioned com- 

 prises chiefly the land around the different rivers, which 

 originating on the mountain-sides finally unite into Rio 

 Santiago, which itself is a tributary to Rio Marahon. Baeza 

 again lies at a considerable distance further north and in a 

 district, which belongs to the river-system of Rio Napo. It 

 is rather natural that the intercourse between the faunas of 

 the different river-systems on the slopes of the Andes is not 

 very lively in consequence of the physical conditions of the 

 country with high and very steep mountains intersected by 



