454 



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



Measurements of an adult male skull: Total length, 19.5; condylobasal 

 length, 18.2; zygomatic breadth, 11.9; mastoid breadth, 10.7; breadth of 

 braincase, 9.2; interorbital breadth, 3.9; maxillar breadth, 7.7; upper 

 toothrow (including canine), 7.1; length of mandible, 12.8; depth at 

 condyle, 3.7; lower toothrow, 7.8. 



Average of 7 adult skulls: Total length, 19.4 (18.8-19.9); zygomatic 

 breadth, 11.6 (11.2-12.2.) 



The description of N. ansorgei so completely agrees with the present 

 series that it might well have been based on any one of several of the speci- 

 mens here recorded. 



52. Nyctinomus leonis Thomas. 



Nyctinomus leonis Thomas, Ann. and Mag. Nat. Hist. (8), II, p. 373, Oct., 1908. 

 Sierra Leone. 



Two specimens, an adult female, skin and skull, Panga, Sept. 8, 1910; 

 an adult male in alcohol, Medje, Jan. 25, 1910. 



Collectors' measurements of the female from Panga: Total length, 106 

 mm.; head and body, 74; tail, 32; foot, 11; ear, 17. Forearm (from skin), 

 39.4. 



Skull, total length, female 18.7, male 20; condylobasal length, 17.3, 

 18; zygomatic breadth, 12, 12.4; mastoid breadth, 10.6, 11.2; interorbital 

 breadth, 3.7, 4; maxillar breadth, 8.6, 8.4; breadth at base of canines, 5.3, 

 5.8; length of upper toothrow (with canine), 6.9, 7.1; length of mandible, 

 12.9, 12.9; depth at condyle, 3.5, 4.7; length of lower toothrow, 7.5, 8.2. 

 First lower premolar about half the size of the second. 



Female skin: above dark chocolate brown, almost blackish brown, the 

 hairs lighter at base; throat pale yellow; sides pale brown; rest of lower 

 parts pale yellowish white. Ears and membranes deep black. A short 

 narrow band of dark brown fur at junction of forearm and humerus. Edge 

 of upper lip conspicuously furrowed, the anterior grooves about 3 mm. in 

 length. 



The skull has the sagittal and lambdoid crests well developed, much 

 heavier in the male; the strong development and backward extension of the 

 lambdoid strongly suggests the condition of the occipital region in Allomops, 

 as does also the larger size of the male as compared with the female. 



These specimens are doubtfully referred to N. leonis (type locality, 

 Sierra Leone). Both have a tuft of lengthened black hairs on the front of 

 the crown, close to the base of the connecting membrane of the ears, the 

 longest of which in the male have a length of 10 mm. 



