1917.] Allen, Lang and Chapin, Bats from the Belgian Congo. 



467 



matic breadth, 16.4; mastoid breadth, 14.1; breadth of braincase, 12; 

 interorbital breadth, 4.3; breadth at canines, 7.8; upper toothrow (c to m 3 ), 

 10.1; depth of skull at pterygoids, 9.6; length of mandible, 18; angle to 

 condyle, 5.8; depth at coronoid, 4.8; lower toothrow (c-m 3 ), 11.5. Average 

 of 6 adult skulls, total length, 27.2 (27-27.8); zygomatic breadth, 16.5 

 (16.1-16.8). 



This species is readily distinguishable by its large size and large and thin 

 ears. The pelage is short and thin, the whitish basal portion showing 

 through the pale brown tips of the hairs. 



62. Mops congicus sp. nov. 

 Plate LV. 



Type, No. 48893, 9 ad. (skin and skull), Medje, Belgian Congo, Sept. 8, 1910; 

 Herbert Lang and James P. Chapin. American Museum Congo Expedition. Orig. 

 No. 966. 



Above uniform deep chestnut-brown, the extreme base of hairs rufous; sides 

 of back and lower back naked; below snuff-brown, passing into bister laterally, the 

 extreme tips of the hairs on the middle area buffy; a naked band at base of uropata- 

 gium, continuous with the wholly naked hind limbs ; wing membranes naked, black- 

 ish brown above, a little lighter brown below; interfemoral membrane naked, dull 

 brown above and below. Ears joined by a low membrane, which extends forward as 

 a protuberance in front of the ears; ears thick and leathery, black, with a strong 

 frontal keel; tragus minute, difficult to 'distinguish in dry skins; antitragus small, 

 low, evenly rounded above, about 5 by 3 mm. Face and chin naked, dark brown; 

 nostrils prominently projecting; upper lip heavily corrugated; thumb with a con- 

 spicuous basal pad. A very small patch of fur near outer base of humerus, and a 

 dense patch on inner upper border of ear; outer base heavily furred. 



Collectors' measurements of type: Total length, 140 mm.; head and body, 91; 

 tail, 49; foot, 17; ear, 22. Type and 12 adult topotypes; Total length, 138 (131- 

 145); head and body, 93.4 (86-100); tail, 45.3 (41-49) ; foot, 15.8 (15-17); ear, 22 

 (20-24). Additional measurements from skins: Type, forearm, 55; third meta- 

 carpal, 54; thumb (with claw), 9.3; foot, 15.8; length of ear on outer border, 19; 

 breadth of ear near upper border, 9.5. Forearm, type and 14 topotypes, 55.8 (54.7— 

 57.4). 



Skull narrow and deep, heavily ossified; a low continuous median crest from 

 front of interorbital constriction, joining the rather heavy lambdoid; preorbital 

 process weak; braincase with a strong transverse preoccipital depression; basisphe- 

 noid pits very deep and large, circular in outline. Upper incisors slightly separated 

 and parallel; lower incisors, middle pair bifid, the outer slender, posterior to the 

 middle pair; canines not specially modified; first upper premolar minute, in the 

 toothrow, separating the canine from p 4 ; first lower premolar about equal in size to 

 the second. 



Skull of type: Total length, 25; condylobasal length, 22.4; zygomatic breadth, 

 15; mastoid breadth, 13.2; interorbital breadth, 4.7; maxillar breadth, 10.3; breadth 



