JMerricurn Four ^Vetr Pecccvries front Mexico. 121 



back, and cover the entire rump, where, when old, they develop swollen 

 whitish nodes or joints giving the rump a very curious appearance.* 



Cranial characters. Skull large, heavy, and massive; upper surface of 

 rostrum and nasals broadly flattened or only slightly convex; nasals 

 acute anteriorly, reaching almost as far forward as premaxillse; xygo- 

 matic ridge rising abruptly to lop of skull and disappearing anteriorly 

 over 2d pre molar; anterior opening of antorbital foramen situated over 

 posterior root of 1st molar; vide* of rostrum broadly flattened (swollen in 

 stead of excavated over premolars, and not divided into upper and lower 

 parts by continuation of xygomatie ridge); palate very broad and flat, ex 

 panded instead of narrowed between canines and molars, and lacking 

 the sharp ridge which in the angulatux group runs from 1st premolar to 

 inner side of canine; angle of underjaw rounded below anteriorly. 



Dental characters. Teeth large and heavy, relatively broad anteriorly: 

 2d lower molar with posterior cusp nearly as large and high as anterior 

 (thus differing widely from its condition in <ai<julatux, in which the 

 tooth is not only very much smaller, but the anterior cusp is high and 

 slender, the posterior nearly obsolete); incisors and canines only slightly 

 larger than in anffulatus; molariform teeth much larger (relative in 

 crease in sixe greatest in 1st and 2d lower premolars. 



Tayassu albirostris ringens subsp. nov. 



T//JH- from Apa/ote, near Yohallun, ( 1 ampeche. No. 108,279, 9 a<-l- 

 U. S. National Museum, Biological Survey Collection. January 1, !!)()!. 

 K. W. Nelson and K!. A. (ioldman. Original No. 14,3s:5. 



('Imnu'terx. Size large (length nearly 4 feet): ears small: color nearly 

 black; muxxle white: rump and median part of back clothed with ex 

 ceedingly long and flexible flattened bristles, frayed at the ends, those 

 on posterior part of back (when old) with terminal third or half marked 

 by distinct joints or nodes (those on rump averaging three or four on 

 each bristle). Similar in general characters to albiroxtri*, from which it 

 differs in the much greater extension of the whitish face markings, the 

 white covering the muxxle completely from snout to midway between 

 nose and eves, and extending backward along sides of underjaw to be 

 low ears, and in the presence of an ill defined white band above hoofs of 

 hind feel. 



C'olor. I'pperparts black, on close inspection sparingly grixxled with 

 fulvous, especially on sides of neck and shoulders; top of head from 

 occiput to midway between eyes anil nose black: muxxle chin and lips 



*Under the microscope the nodes are found to mark points where the 

 horny longitudinal fibers of the outer coat have begun to break and 

 spread. Transverse sections at these points, made by my assistant Dr. 

 S. 1). Judd, show that complete disintegration of the interior radiating 

 pith or core has taken place, and indicate that the nodes are confined to 

 the dead terminal parts of the bristles. 



