1917] Allen, Lang and Chapin, Bats from the Belgian Congo. 437 



adults, not fully mature as regards size. The others are fully adult, all with perfect 

 skulls except the Niapu specimen, of which the skull is too much broken for measure- 

 ment. 



The specimens represent two seasonal periods, April, and September- 

 January. The April specimens (from Medje), in worn pelage, are browner 



i 



Fig. 6. Hipposideros langi. Pubic region of male (No. 49391). A , anal sac invaginated ; B, anal 

 sac everted, j. 



and the light tips of the hairs are stained faintly yellowish in contrast with 

 the clear blackish brown ground-color and whitish hair-tips of the Septem- 



