Men-tarn Four JVW 7V<v//-/<v? from M<. >'!<<>. 123 



Remarks Compared with sonoriensisof Arizona the sides are less gray, 

 the dorsal band less sharply defined, the shoulder stripes yellower and 

 much more strongly marked. The sexual disparity in size is greater 

 than in sonoriensis, the female being considerably larger than the male. 



Measurements. Type ( 9 ad.): total length <)(><): tail GO: hind foot 21.1. 

 Skull: basal length 203; occipitonasal length 224; zygomatic breadth 

 108; greatest breadth across squamosals posteriorly 99; palatal length 

 151; length of upper molariform series 67. 



Tayassu angulatus yucatanensis subsp. nov. 



Type from Tunkas, Yucatan. No. 108,282, $ yg-ad., U. S. National 

 Museum, Biological Survey Collection. February 12, 1901. E. W. Nel 

 son and E. A. Goldman. Original No. 14,534. 



Characters. Sexes nearly alike, the female not noticeably larger than 

 the^male. Si/e and general characters much as in anattlatus but sides 

 decidedly whiter; shoulder stripes broader, much more conspicuous, 

 and somewhat subtriangular, broadest where they abut against the me 

 dian dorsal black band which is well developed: (shoulder stripes broad 

 est and most striking in young:) pelage coarser and scantier, the indi 

 vidual bristles decidedly larger and fewer in number: no black on nose 

 or underlip. Skull similar to that of angulatus but nasals acute and 

 rather short anteriorly, exposing more than usual of the floor of the an 

 terior nares (upper surface of premaxilhe); posterolateral upward ex 

 tension of squamosal (above and in front of auditory meatus) decidedly 

 shorter than in angulatus, molariform teeth smaller and narrower par 

 ticularly the lower molars; in skulls young enough to show the sutures 

 the nasals are short and very narrow between premaxilhe and expanded 

 in the middle very different from either angulatus or humeralis; they 

 are more like those of nanus, but more contracted anteriorly. 



Remarks. Specimens from Tunkas and Chichen Itza in the arid penin 

 sula of Yucatan are typical of this form, but specimens from the 

 humid east coast strip are by no means typical and appear to represent 

 a tropical form which here reaches its northern limit. Thus an adult 

 male from La Vega (No. 108,514*) is larger and has coarser pelage than 

 those from the arid interior, and differs considerably in color, the light 

 rings on the bristles being yellowish fulvous instead of white, and the 

 underlip blackish. 



Measurements. Type ( $ yg-ad.): total length 880; tail 3(5; hind foot 

 183. Average of 2 males from type locality: total length 887; tail 36; 

 hind foot 182.5. Average of 3 females from type locality: total length 896; 

 tail 36; hind foot 184. 



*The measurements of this specimen are: total length 945; tail 34; 

 hind foot 202. 



