1917.] 



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



457 



of the wing membranes, between the humerus and femur, is without the white band 

 of fur seen in hindei. 



Entire body dark brown except a broad, usually well-defined pure white median 

 area from opposite the shoulders to base of tail, covering about one-third of the 

 ventral surface of this part of the body, varying somewhat in extent in different speci- 

 mens. Wing membranes white above, except proximately from elbow to knee where 

 they are brownish, the tone deepening toward the body; below wholly white. Inter- 

 femoral membrane brown both above and below. Ears joined by a deep membrane, 

 fringed above with short stiff hairs about 0.5 to 1 mm. in length, and similarly cov- 

 ered in front and on the central part of its posterior face. Tragus minute, quadrate, 

 about 1 mm. square. Antitragus rounded above, about 2.5 mm. in height and about 

 3 mm. wide at base. In 18 of the 22 well-preserved alcoholic specimens the front 

 half of the crown behind the membrane joining the ears is naked; in the other four 

 this area is slightly covered with fine fur. The ears are thinner and broader than in 

 C. hindei. 



External measurements of the type: Total length, 80 mm.; head and body, 50; 

 tail, 30; forearm, 37; third metacarpal, 35.5; thumb to base of the prominent 

 pad, 6; tibia, 10.5; foot, 7.2; ear from crown, 8.7; from the notch behind the anti- 

 tragus, 12. Forearm, average of 22 topotypes, 36 (35-37). Forearm in type of 

 hindei, 40; in five specimens from near the type locality, 37.6 (37-39.4). 



Skull, type (corresponding measurements of type of hindei in parenthesis): 

 Total length, 15.2 (17.6); zygomatic breadth, 9.4 (11.4); upper toothrow, 5.4 (6.7). 



Seven skulls (removed from alcoholic specimens), 1 male and 6 females, measure 

 as follows: Total length, 15.9 (15.4-16.4); condylobasal length (4 skulls), 14.3 

 (13.8-14.8); zygomatic breadth, 9.5 (9.0-9.9); mastoid breadth, 8.9 (8.7-9.2); 

 breadth of braincase, 8.3 (7.9-8.4); interorbital breadth, 3.4 (3.3-3.6); breadth at 

 base of canines, 4.2 (3.6-4.5); maxillar breadth, 6.8 (6.4-7.8); upper toothrow 

 (c-m 3 ), 5.4 (5.2-5.6); length of mandible, 10.1 (9.5-10.6); angle to condyle, 2.5 

 (2.3-2.9); depth at coronoid, 2.6 (2.2-2.9); lower toothrow (c-m 3 ), 5.9 (5.6-6.1). 



Represented by 22 specimens in alcohol, all from Malela, the type locality. 



Six skulls of C. hindei, two from the type locality (Fort Hall, B. E. Africa) and 

 three from a nearby point (collection of United States National Museum) measure 

 as follows (the corresponding measurements of six skulls of C. frater are given in 

 brackets): Total length, 17.5 (17.3-18) [15.9 (15.4-16.4)]; zygomatic breadth, 

 10.6 (10.5-10.8) [9.5 (9.2-9.9)]; length of mandible, 11.4 (11.2-12) [10.1 (9.5-10.6)]. 

 A single skull from Mombasa (collection of Museum of Comparative Zoology), exactly 

 agrees in measurements with the average of the five from the Fort Hall region. 



In general form the skull is a miniature of that of C. hindei but dis- 

 proportionate weaker, especially in respect to the mandible and dentition. 

 In four of the seven skulls examined, the premaxillse are fully ossified, as 

 in typical Chcerephon; in the others there is a U-shaped vacuity behind the 

 incisors and the incisors are not united by an osseous border. In this 

 species, as in C. abce and some other species of Chcerephon of which I have 

 been able to examine a series of skulls, a similar condition exists, the younger 

 specimens often having the premaxillse imperfectly ossified at the incisive 

 border. In one skull p 2 is in the toothrow on the left side, but on the right 



