1906.] A lien , Mammals from Western Mexico . 225 



Skulls: 6 males, total length, 119 (114-125); basal length, 105 

 (102-108); zygomatic breadth, 64 (61.5-65); mastoid breadth, 42 

 (41.5-43): 3 females, 117 (116-118), 105, 43. 



"Most common on uplands. Is quite tame in some localities 

 and easy of approach. Hunts mostly at night, occasionally uttering 

 a hoarse bark. Feeds largely on wild figs, fruit'of the coporno, and 

 berries; also on small rodents, grasshoppers, and beetles. It is an 

 expert climber and usually goes up a tree when hard pressed by 

 dogs. Female has from four to six young. " J. H. B. 



26. Ursus sp. 



Represented by a single imperfect skin, purchased of a native 

 hunter, taken in the vicinity of Escuinapa. 



27. Conepatus sonoriensis Merriam. 



Fifteen specimens, Escuinapa and immediate vicinity, Feb. 5- 

 March i, and one each July 5 and Nov. 4. 



Collector's measurements: 5 males, total length, 729 (647-833); 

 head and body, 416 (368-457); tail vertebrae, 313 (267-381); hind 

 foot without claws, 72 (64-76); with claws about 8 mm. more; fore 

 claws, 13-15; ear from notch, 26 (23-29): 7 females, total length, 634 

 (584-697); head and body, 374 (292392); tail vertebras, 279 (242 

 305); hind foot without claws, 69 (64-76); ear from notch, 24 



(23-^5). 



Skull: 5 males, total length, 81.4 (76-85); basal length, 66.5 

 (62-71) ; zygomatic breadth, 48 (43-53) i mastoid breadth, 41 (38-43): 

 4 females, total length, 78 (75-80) ; basal length, 63 (61-65) ; zygomatic 

 breadth, 45.7 (41.5-49); mastoid breadth, 40 (38-41.5). 



In the average females are decidedly smaller than males, but the 

 range of individual variation is so great that the two sexes distinctly 

 overlap in size, the larger females equalling the smaller males. 



The measurements given above are from adult examples, but only 

 three or four have the worn teeth and other characters of old age; 

 the greater part are middle-aged or young adults. While not differ- 

 ing appreciably from the large series of Jalisco specimens of this species, 

 they average slightly larger, due apparently to the age of the latter 

 averaging younger. 



The old specimens taken in February are in worn faded pelage, 

 the black of the sides, limbs, and ventral surface being a dull brown 

 black in strong contrast with the deep black of the younger examples. 

 The black at the base of the lower surface of the tail varies in amount 



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UNIVERSITY 



