196 Bulletin American Museum of Natural History. [Vol. Ill, 



haired, blackish, apparently (judging from the dry skin) without warts or tuber- 

 cles. Thumbs with a small basal pad. Toes thinly haired. Wing membranes 

 from the base of the toes, pale brown, everywhere wholly without fur. About 

 half of the last caudal vertebra free. 



Pelage long, full, and soft. Whole dorsal surface deep black, the fur uniform 

 from the surface to the base, except on the rump, and a large patch on each 

 shoulder, where the apical half of the fur is pure white, the basal portion being 

 black. The white rump patch has a length of about three-fourths of an inch, by 

 a width of half an inch. The shoulder patches are symmetrical in form and posi- 

 tion, being directed obliquely backward and inward, about half an inch wide by 

 nearly an inch in length. The black of the dorsal surface extends downward on 

 the sides of the neck in front of the shoulders, forming a broad lunate patch on 

 each side. Posterior base of the ears, the whole throat and sides of fore neck 

 to the ears, pure white, the fur dusky at the base. Rest of the lower surface 

 with long white tips to the hairs, which over the breast are so long as to wholly 

 conceal the dusky underfur. 



Measurements. Length of head and body, 62 mm. (2.45 in.) ; tail, 49.5 mm, 

 (1.95 in.) ; length of ear, 38.1 mm. (1.50 in.), width across the middle, 27.9 mm. 

 (i.ioin.); height of tragus, 12.7 mm. (.50 in.), breadth at middle, 5.6 mm. 

 (.22 in.) ; humerus, 29.7 mm. (1.17 in.) ; forearm, 50.8 mm. (2.00 in.) ; thumb, 

 6.9 mm. (.27 in.); third finger : metacarpal, 49.3 mm. (1.94 in.), ist phal., 

 15.75 mm. (.62 in.), 2d phal., 27.9 mm. (i.ioin.)=95.5 mm. (3. 76 in.) ; fourth 

 finger: metacarpal, 46.2 mm. (1.82 in.), ist phal., 14 mm. (.55 in.), 2d phal., 

 16 mm. (.63 in.)=76.2 mm. (3.00 in.); fifth finger: metacarpal, 45.7 mm. 

 (1.80 in.), ist phal., 11.4 mm. (.45 in.), 2d phal., 10.2 mm. (.40 in.)=&7.3 mm, 

 (2.65 in.) ; femur, 43.7 mm. (1.72 in.) ; tibia, 22.9 mm. (.90 in.) ; hind foot, 

 7.6 mm. (.30 in.). 



Skull and Dentition. Basilar length, 16.5 mm. (.65 in.) ; total length, 19 

 mm. (.75 in.) ; zygomatic width, 10.9 mm. (.43 in.) ; height, 7.6 mm. (.30 in.) ; 

 length of lower jaw, 12.7 mm. (.50 in.) ; height at condyle, 33 mm. (.13 in.) ; 

 height at coronoid process, 3.8 mm. (.15 in.) ; length of upper tooth row, 6.86 

 mm. (.27 in.) ; length of lower tooth row, 7.6 mm. (.30 in.). Dental formula : 

 incisors, &- ; canines, {-^ ; premolars, ^ ; molars, fif =|f =32. 



The skull is thin and papery, being evidently that of a young animal. The 

 facial portion is narrow and pointed ; the brain case is quadrate, flattened above, 

 but rises abruptly at the frontal border, the forehead being suddenly depressed. 



The lower border of the zygomatic arch is curved upward ; the upper border 

 is greatly expanded vertically, the upper border of the malar forming a high 

 angular process at the middle of arch ; the zygomatic process of the squamosal 

 is short, and, with the malar, passes forward in a line nearly parallel with the 

 axis of the skull, with only a very slight outward cuvature. The tympanic bullse 

 are enormously expanded, having an antero-posterior length of 5.84 mm. (.23 in.) 

 and a transverse breadth of 3.3 mm. (.13 in.), their length fully equaling one- 

 third of the length of the skull. In other respects the ventral aspect of the skull 



