458 



Bulletin American Museum of Natural History. [Vol. XXXVII, 



side is on the outer edge of the toothrow, as it is on both sides in all of the 

 other five skulls. Usually p 2 separates the canine from p 4 , but in two 

 instances p 2 is crowded so far out that the canine and p 4 are in contact. The 

 first lower premolar is about one-third smaller than p 4 . 



The nearest known form to C. frater is C. hindei (type locality, Fort 

 Hall, Kenya district, British East Africa), from which frater differs in smaller 

 size, especially in the smaller size of the skull and much weaker dentition. 

 It also differs in color, particularly in having a larger area of white on the 

 middle of the belly and in the absence of white on the proximal border of the 

 wing membranes. As shown above, in a series of six skulls of each form, 

 the extreme measurements do not overlap, the smallest hindei skull being 

 considerably larger than the largest frater skull. The males of hindei have 

 a low broad tuft of dark hair behind the membrane joining the ears, arising, 

 from the front part of the crown (not from the back of the frontal membrane, 

 as in Lophomops), but in frater this part of the crown is usually bare in both 

 sexes, and hence of course without the frontal tuft found in the males of 

 hindei. 



C. frater is about the size of C. limbatus (Peters) from Mozambique, with 

 which it shares the character of white wing membranes, but limbatus evi- 

 dently (judging from descriptions) belongs to a different section of the genus 

 {Lophomops), the males being said to have a "long crest of erect hairs 

 behind the connecting membrane of the ears" (de Winton). The absence 

 of white on the lower parts and the character of p 2 would also exclude 

 limbatus from further consideration in this connection. 



56. Chserephon russatus sp. nov. 

 Text Fig. 25, p. 550. 



Type, No. 48925, & ad., skin and skull, Medje, Belgian Congo, Sept. 8, 1910; 

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

 No. 993. 



Above uniform russet-brown, with a large median nearly hairless spot at shoulders; 

 below cinnamon-brown, the extreme tips of the hairs on the median area faintly 

 lighter in some specimens but as a rule not appreciably so; a band of cinnamon- 

 brown bordering the underside of wing membrane between humerus and femur; 

 wing membrane (in dry skins) dark brown proximally as far as the fourth digit, the 

 •outer portion slightly paler and semitranslucent; uropatagium dull brown, both 

 above and below. Ears thickened on front border, blackish brown, united by a 

 membrane at base, which projects as a rounded protuberance in front of the ears. 

 Tragus minute, narrow, about 3.5 mm. high by about 1 mm. wide, blackish. Anti- 

 tragus rather small, about 5 mm. wide at base and 3.5 in height, evenly rounded 

 above. Tail about 34 mm. in length, the apical half free, the basal third below 



