432 



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



12.4; mandibular toothrow, 7.2. Four male topotype skulls 1 (including type), 

 total length, 20.1 (19.8-20.3); zygomatic breadth, 10.5 (10.3-10.6); interorbital 

 breadth, 2.9 (2.8-3); length of mandible, 12.4 (12.2-12.5). 



H. caffer niapu seems clearly to represent a large race of the caffer group, 

 larger than any hitherto described. In Andersen's table of measurements 

 of the forms of the caffer group, 2 based on 98 specimens (including 75 skulls), 

 the maximum length of the forearm is given as 53.8 for 24 specimens of 

 centralis, as against 54.7 in 10 specimens of niapu, while the maximum in 40 

 specimens of typical caffer is 51.8. He gives (I. c, p. 276) the average 

 forearm length for 40 specimens of H. caffer caffer as 48.6, and for 50 

 specimens of centralis-guineensis (which do not differ in size) as 50.6, as 

 against 54.7 in 10 specimens of niapu, the latter exceeding the centralis- 

 guineensis series by 4 mm. The skulls bear out the evidence of larger size 

 for the niapu series, in which the average total length of the skull is 1 mm. 

 greater than in the centralis-guineensis series, which is equal to the average 

 difference between the latter and typical caffer. 



H. c. niapu is represented by 10 adult specimens (6 males, 4 females), 

 all from the type locality, and all collected the same day. It is clearly 

 specifically different from the much larger H. abod described below from a 

 series of 35 skins and skulls, all from Aba, and all collected also during one 

 day. 



24. Hipposideros abse sp. nov. 



Type, No. 49123, cf! ad. (skin and skull), Aba, Uele district, Belgian Congo, 

 Dec. 13, 1911; Herbert Lang and James P. Chapin. American Museum Congo 

 Expedition. Orig. No. 1715. 



Upperparts (type, an average specimen of the dark phase) heavily washed with 

 bistre from the shoulders posteriorly; lighter anteriorly through the shorter dark 

 tips of the hairs, which nearly disappear on sides of head, neck and shoulders, which 

 are thus much lighter than the back; underparts buffy gray, much lighter on throat; 

 ears light brown, rather small, tip obtusely rounded; feet and ventral surface of 

 limbs light brown; membranes dark brown. 



Type, total length (collectors' measurements), 104 mm.; head and body, 66; 

 tail, 38; foot, 12; ear (from outer base), 20. Forearm (from skin), 58.5; tarsus, 

 23.2; foot, 11; ear (from inner base), 16. 



Skull (type), total length, 23; zygomatic breadth, 13; width of braincase, 11; 

 maxillar breadth (across m 3 ), 8.8; breadth at base of canines, 6.1; upper toothrow 

 (c-m 3 ), 8.2; length of mandible, 14; lower toothrow, 9.4. 



Posterior border of nose-leaf rounded; three secondary cutaneous leaflets, the 

 outer one slightly developed; a frontal sac in the males, absent or much less devel- 



1 Selected at random for removal from a 

 ing but 3 mm. in the length of the forearm. 



2 Ann. and Mag. Nat. Hist. (7), XII, p. 



series of 10 alcoholic specimens, the series as a whole vary- 

 282, March, 1906. 



