102 Merriam New Mammals from Cozumel Island. 



Characters. Externally similar io yueatanensis Allen, but body larger 

 (in 2 ad. <j"s averaging 883, contrasted with 364 in 2 ad. $ y-ucatanensis; 

 in 2 ?s averaging 359 contrasted with 327); tail much shorter (in 2 (^s 

 averag'ing 317 contrasted with 3,34 in 2 ad. tf yucatanensis; in 2 females 

 averaging 290 contrasted with 370): hind feet same size: skull similar 

 but decidedly larger; rostrum very' much broader; nasal* broader and flat- 

 ter (especially the anterior jj): posterior roots of zygomata standing out 

 ,more squarely: /ygomatic arm of squamosal larger and more broadly 

 expanded vertically: palate broader: anterior rudiment of auditory 

 capsule (sphenoid bulla) much smaller and more irregular in form. 



Measurement*. Type specimen (<$ ad.): total length 703: tail verte 

 bra 324: hind foot 59. Average of 2 males from type locality: total length 

 700; tail vertebra 1 317: hind foot 50. An ad. 9 from type locality: total 

 length (570; tail vertebra 1 209: hind foot 5.). Average of 2 females 

 from type locality: total length 055; tail vertebra 1 29(5: hind foot 55. 



Tayassu nanus sp. 



Type from Cozumel Island, Yucatan, No. 108,510. -f'ad., V. S. National 

 Museum, Biological Survey Collection. April 7, 1901, E. W. Nelson 

 and E. A. Goldman. Original No. 14, (5(54. 



Characters. Size small; related to an</ul<itus but only about two-thirds 

 as large: color not markedly different from that of anyulatus except nose 

 and chin which are blacker. 



Color. Upperparts finely grizzled black and butt'y, with distinct buffy 

 shoulder-stripe (as in angulatus and tajacu}; nose, chin, dorsal stripe 

 (from occiput to tail), ears, and feet, black. The black nose and chin 

 are most conspicuous in the young and are sufficient to distinguish the 

 species from T. angulatus. 



Cranial characters. Skull short and broad, especially broad posterior 

 ly, with abruptly spreading zygomata and very large bulla 1 . Compared 

 with skulls of angulatus from Texas and eastern Mexico, the skull is of 

 nearly the same breadth, but very much shorter, with much more 

 abruptly spreading zygomata (anteriorly), giving a very different physi 

 ognomy: relatively larger bulla 1 , and very much smaller molariform 

 teeth, the canines and incisors nearly as large as in anyulatus. The 

 angle of the jaw is broadly expanded and rounded as in angulatus, but 

 differs in having its posterior margin strongly inttexed. In skulls young- 

 enough to show the sutures, the nasals are expanded and squarely trun 

 cate posteriorly and rather broadly expanded in the middle. 



Measurements. Type specimen (^ ad.): total length 840; tail verte 

 bra? 32; hind foot 178. Average of 3 males from type locality: total 

 length 823: tail vertebrae 30; hind foot 175. An adult 9 from type local 

 ity: total length 780; tail vertebra 1 30; hind foot 177. Skull of type: 

 basal length 170; basilar length of Hensel 1(58: palatal length 120: occi- 

 pitonasal length 189; zygomatic breadth 100: upper molariform series 

 of teeth 52. 



