1899.] NATURAL SCIENCES OF PHILADELPHIA. o85 



the outer surface blackening on the terminal fourth and along 

 anterior edge. Extreme anterior margin fringed with pale buff. 

 This border is continuous through whole jDeriphery of ear, but is 

 broadest and composed of the longest hairs through lower anterior 

 half. Inner surface of ear thickly sprinkled with fine whitish 

 hairs. Crown of head slightly darker than back. Cheeks paler 

 than sides, but strongly shaded with black. A conspicuous whitish 

 area surrounding eye and broadening posteriorly to a width of 

 about 10 mm. Chin and upper part of throat dull white. Chest 

 and lower throat ochraceous bufT, darkened by a sparse sprinkling 

 of black tipped hairs. The hairs of this buft area are slightly 

 lengthened to form an inconspicuous ruff. Legs cinnamon rufous, 

 the gray of the sides extending over most of outer side of thigh, but 

 scarcely reaching below shoulder. White of belly extending down 

 inner side of hind leg and covering dorsum of pes. On front leg 

 it extends as a narrow band on inner side to carpus. Belly dull 

 white, strongly tinged with buff on chest. 



Skull and Teeth. — The skulls of Lepu-s floridanus yucatanicus 

 average slightly larger than those of L. floridanus aztecus, and the 

 zygomatic arches are relatively deeper and heavier. Otherwise 1 

 can see no tangible differences in general form. Audital bulla3 

 considerably larger and more inflated than in L. floridanus aztecu!<. 



Mea,'^wements. — External measurements of type : Total length, 

 430 mm. (estimated, skin stretched); hind foot, 198; ear from 

 crown, 71. Average of five specimens, including the type: Total 

 length, 412 (400-430); tail vertebra, 33.5 (33-34); hind foot, 92 

 (85-98); ear from crown, 78.5 (68-75). These measurements are 

 taken from badly prepared skius, and are only approximately 

 reliable. 



Cranial meaurements of type: Greatest length, 82 mm.; basal 

 .length, 64; basilar length, 62; henselion to posterior edge of bony 

 palate (median), 33; least (lateral) length of bony palate, 7.8; pos- 

 terior edge of bony palate to hamular, 17; length of incisive fora- 

 men, 21; width of incisive foramina, 9.4; zygomatic breadth, 39; 

 interorbital breadth (inclusive of supraorbital processes), 20; 

 greatest breadth of brain case, 29; breadth of rostrum at base of 

 zygomata, 22.6; greatest (diagonal) length of nasals, 37; greatest 

 breadth across both nasals, 16; least breadth across both nasals 

 25 



