1906.] Allen, Mammals from Western Mexico. 2 \ 5 



nal in habits, usually hiding away in high grass or up in high trees 

 during the day. The female has from two to four young about July 

 and August." J. H. B. 



Collector's measurements of 2 adult males: total length, 1766, 

 1727; head and body, 1156, 1105; tail vertebrae, 610, 622; hind foot 

 without claws, 229, 229; ear from notch, 83, 86. 



The coloration in four of the specimens is quite similar, although 

 two were taken in August and two in October. The ground color 

 is pale clay color and the dark markings are more restricted than in 

 South American specimens, in which latter also the ground color is 

 much deeper and more ochraceous. A single specimen, an adult 

 male, from Achotal, Vera Cruz, now before me (No. 3674, Field 

 Columbian Museum) is practically indistinguishable from the paler 

 Escuinapa specimens, both in coloration and cranial characters, 

 although it should represent the alleged subspecies Felis onca gold- 

 mani Mearns. 



An imperfect skull (lacking both zygomatic arches) from Frontera, 

 Tabasco, Mexico, differs from all the other Mexican specimens in 

 its much greater size, as shown (No. 18061) in the subjoined table 

 of measurements. 



Fifteen skulls from various localities in South America (Paraguay, 

 Parana, Bolivia, Brazil, Venezuela) indicate a similar wide range in 

 size. These localities are as follows: two from Paraguay; one from 

 San Jose, Parana; one from Jaguar Lake (on the boundary of Brazil 

 and Bolivia) ; two from southern Brazil (Matto Grosso) ; one from 

 Santarem, on the Amazon; four from the lower Amazon; one from 

 Maripa, Venezuela; and several from unknown South American local- 

 ities. The largest of all, with a basal length of 242 mm., is from 

 Paraguay; the other largest South American skulls range in basal 

 length from 203-214 mm., while the two largest Mexican specimens 

 have a basal length, respectively, of 220 and 227 mm., and others 

 range from 188 to 217 mm. 



Dr. Mearns, in a paper on 'The American Jaguars,' published in 

 1901 (Proc. Biol. Soc. Wash., XIV, pp. 137-143, Aug. 9, 1901), con- 

 sidered the South American Jaguars separable from those of Central 

 America and Mexico, on the ground of the presence in the former 

 of a wider postpalatal fossa, differently shaped bullae, larger size 

 of the premolar teeth, and larger general size of the skull. These 

 differences are mainly comparative, but for the most part are well- 

 sustained by the present series of 24 skulls. One of the best distinc- 

 tions is the width of the postpalatal fossa, which varies in the Mexican 



