28. PTOODEKMA.. 537 



lanceolate, the front edge of the horseshoe bound down to the 

 miizzle ; ear-coDch and tragus as in Artibeus dnereus ; eyes large, 

 not concealed. From either side of the front margin of the nose- 

 leaf a slightly raised, very narrow, but weU-defined ridge passes 

 backwards to the angle of the mouth, appearing like the margin of an 

 upper lip, below this ridge the fur of the face does not pass ; lower 

 lip with a central wart, margined on either side by a similar wart, 

 and five small warts in a semicircle beneath (Plate XXX. fig. 3). 



Interfemoral membrane circularly emarginate behind, about 0-3 

 inch deep in the middle ; wings from the metatarsus close to the 

 base of the toes. 



Fur moderately long and dense ; above, dark brown at the base, 

 then pale buff, the extremities of the hairs dark brown ; beneath, 

 greyish brown throughout ; on each shoulder, at the origin of the 

 antebrachial membrane, a small patch of white hairs. On the upper 

 surface the fur extends thickly outwards upon the forearm to within 

 a short distance from the carpus, ending rather abruptly, densely 

 clothing the wing-membrane behind the humerus and forearm, ex- 

 tending more thinly upon the legs to the ankles and upon the 

 adjoining wing-membrane; the interfemoral membrane is well 

 covered with moderately long hairs, which form a fringe along its 

 posterior margin ; the proximal third of the last metacarpal is clothed 

 with hair. 



Facial bones greatly enlarged vertically, forming large rounded 

 eminences above the orbits with a broad flattened intervening space 

 above, behind which the crown of the skuU is slightly elevated 

 (Plate XXVIII. fig. 46) ; incisors as in Ametrida, the central incisors 

 unicuspidate, triangular, directed vertically downwards, the cingu- 

 lum of each tooth with a small basal projection externally ; outer 

 incisors scarcely elevated above the gum, flat-crowned, filling the 

 space between the canines and the inner incisors ; upper premolars 

 nearly equal in size, almost equal to the canine in transverse sec- 

 tion and equalling three fourths its vertical extent ; first upper molar 

 slightly larger than the second premolar in cross section ; second 

 molar minute, similar in form and size to the outer upper incisors 

 (Plate XXVIII. figs. 4, 4 a); lower incisors equal, deeply grooved 

 above and in front, placed in a straight line between the canines ; 

 lower premolars equal to the upper, with posterior basal projections ; 

 first lower molar larger than the second premolar in cross section, 

 flat, with acute projections along its inner edge ; last lower molar 

 scarcely one third the size of the first molar (Plate XXVIII. fig. 4). 



Length, head and body 2" -4, nose-leaf 0"-5x0"-28, ear 0"-7, 

 tragus 0""28, forearm 1""5, thumb 0"-5; third finger — metacarp. 

 l"-4, 1st ph. 0"-65, 2nd ph. 1", 3rd ph. 0"-5; fourth finger— 

 metacarp. l"-4, 1st ph. 0"-45, 2nd ph. 0"-7 ; fifth fijiger— metacarp. 

 l"-45, 1st ph. 0"-45, 2nd ph. 0"-6 ; tibia 0"-65, foot 0"-45. 



Eah. Mexico ; Brazil. 



a. ad. sk. Brazil. Purchased. 



(Type of Arctibeus leucomus, Gray.) 



