138 Mearns The American Jaguars. 



crown of upper carnassial measuring 31 by 16; crown of mid 

 dle upper premolar, 20 by 13; length of upper canine from 

 gums (tooth worn), 37; length of incisor toothrow, 33.5. The 

 audital bullae are greatly flattened, the space between bulla and 

 paroccipital filled, but that between it and mastoid not com 

 pletely so. Brazilian skulls are somewhat smaller than those 

 from Parana, Paraguay, and Bolivia, and have smaller teeth, 

 less flattened audital bullas; and in some there is a sulcus be 

 tween the bulla and the mastoid process. 



The juguars of South America may be distinguished from 

 those of (Central America and Mexico as follows: 



South American Jaguars. Mexican and Centra/ American Jaguars. 



Postpalatal fossa, in adult male, Postpalatal fossa less than 23 



more than 2'.} mm. wide. mm. wide. 



Audital bulla flattened, with Audital bulla inflated, with deep 

 space between it and paroccipital fossa 1 between it and the mastoid 

 and mastoid processes filled up. and paroccipital processes. 



Length of second and third pre- Length of second and third pre- 

 molars, taken together, more than molars, taken together, less than 

 45 mm. 45 mm. 



Maximum diameters of male Maximum diameters of male 

 skull, HOO by 200 mm. skull, 280 by 180 mm. 



The remaining forms, from north of South America, of which 

 I have examined six skins and thirteen skulls, may be identified 

 by means of the following key: 



Skin with a rosette pattern, in black, extending from 

 neck to hips and from vertebral line to belly. Outer 

 surface of ear, all black. Skull of male less than 215 

 mm. in basal length. Inhabits Central America, 

 from Honduras to Panama Felis centralis. 



Skin with distinct rosettes only on middle dorsal area; 

 elsewhere they are disorganized into isolated black 

 spots. Outer surface of ear with a tawny central spot. 

 Skull of male more than 215 mm. in basal length. 

 Distributed throughout the lowlands of Mexico and 

 the adjacent border of the United States. 



