1906.] Allen, Mammals from Western Mexico. 199 



all sharply differentiated, the average differences being more or less 

 obscured by the large amount of individual variation found in every 

 large series of specimens. True T. angulatum, from the Lower Rio 

 Grande and eastern Texas, is darker, with a more massive skull, 

 broader postpalatal region, and rather heavier dentition than son- 

 oriense, as represented by Arizona specimens, which are, on the other 

 hand, rather lighter and grayer than the Escuinapa series, with also 

 a relatively broader skull. The Arizona specimens are, however, 

 much older than any of the specimens from Escuinapa, and the slightly 

 more massive character of the skull may be due to the greater age of 

 the specimens. 



" Most common along the Pacific coast, especially in the lowlands. 

 They follow up canons and beds of streams, in small bands or singly, 

 often to an altitude of 5,500 feet, but few are found higher than 

 2,000 feet. Those found at the higher elevations are larger and shyer, 

 and have longer and coarser bristles. I have never seen any more 

 than ninety miles (air line) from the Pacific coast. 



"The Peccary interbreeds freely with domestic pigs, and associ- 

 ates with them on apparently as good terms as with its own kind. It 

 feeds on many things, like the bear, but principally on the leaves of 

 various shrubs, the blossoms of flowering trees, wild figs, berries, 

 and the fruit of the coporno. 



"During many years' observations, I have never seen a female 

 with more than two young, though it is said by the natives about 

 Escuinapa that as many as seven young have been found, on several 

 occasions, with one female. 



"The hearing of the Peccary is acute, and it has a keen sense 

 of smell. Both sexes are hard fighters. An old male generally leads 

 the band, and at a signal from him the others will scatter and hide, 

 or attack, as the case may be. Many dogs are killed by Peccaries, 

 being torn open or gashed by their long, sharp-edged canine teeth. 

 When about to attack, the Peccary lowers its head, champs its teeth, 

 and advances sideways with its mouth open and under jaw turned 

 to one side, ready for an upward lunge to rip up its enemy. When 

 a band is attacked by many dogs, the Peccaries immediately close up 

 in a bunch, forming a ring with heads outward, which position they 

 stubbornly maintain, fighting until the dogs leave them, the dogs 

 knowing that they cannot break the circle without being killed or 

 badly cut by the Peccaries' tusks." -J. H. B. 



The collector's measurements are as follows: 9 adult males (m 1 

 slightly worn in the youngest, and the teeth not greatly worn in any), 



