•4 



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



at canines, 8.7; breadth of braincase, 11.7; depth of braincase at condyles, 9.5, at 

 bullae, 10.7; upper toothrow (with canine), 8.9; length of mandible, 19.4; angle to 

 condyle, 5.6; depth at coronoid, 4.6. 



Skull, type and 11 topotypes (1 male, 10 females), total length, 25 (24.4-25.6); 

 zygomatic breadth, 15 (14.5-15.6). 



Represented by 15 specimens (of which 3 are alcoholic), all taken at Medje, Sep- 

 tember 8, 1910. 



Cheer ephon congicus is easily distinguished by its size, and dark colora- 

 tion. The length of the forearm averages 56 mm. in a series of 12 adults, 

 the skull 25, zygomatic breadth 15. It greatly exceeds the size of C. 

 angolensis, from which it also differs in other important characters. The 

 forearm in angolensis is given by Peters as 48 mm., and by Dobson as 47 mm., 

 while the average in congicus is 55.8. It differs from C. midas in being 

 smaller (forearm 55.8, in midas 60.4), with much smaller ears and much 

 darker coloration. 



63. Mops niangar® sp. nov. 



Type (and only specimen), No. 48901, c? ad. (skin and skull), Niangara, north- 

 eastern Belgian Congo, Dec. 12, 1910; Herbert Lang and James P. Chapin. Ameri- 

 can Museum Congo Expedition. Orig. No. 1313. 



Similar to M . congicus but smaller and much paler. 



Upperparts uniform cinnamon-rufous, extreme base of hairs much lighter; under- 

 pays tawny-brown, lighter and more yellowish on the pectoral area; ears, membranes 

 and the broad naked space along sides of back and posterior margin of body dark 

 brown; ears not joined at base, thick, and otherwise as in M. congicus. A large 

 crown-patch of lengthened hairs, similar in color and texture to the surrounding 

 pelage, but much longer, forms a broad, low crest covering the interaural portion 

 of the head. 



Collectors' measurements: Total length, 125 mm.; head and body, 91; tail, 34; 

 foot, 13; ear, 22. Forearm (from skin), 52; third metacarpal, 52; foot, 13; ear 

 from crown, 8.6; from notch at antitragus, 21; transverse breadth, 13.2; tragus 

 very small, breadth at base and height about equal. 



Skull, total length, 23.2; condylobasal length, 21.6; zygomatic breadth, 14.4; 

 breadth of braincase, 11.1; interorbital breadth, 4.6; maxillar breadth, 9.8; breadth 

 at base of canines, 7.1; upper toothrow (with canine), 8.2; length of mandible, 16; 

 depth at condyle, 5.4; at coronoid, 4.5; lower toothrow, 9.4. 



Mops niangara? is structurally closely similar to M. congicus, but is 

 smaller and much paler, and the ears are not joined by a membrane. The 

 forearm is 4 mm. shorter and the cranial measurements are correspondingly 

 less. 



This is the only species of molossid bat in the present collection, number- 

 ing 19 species, in which the ears are not joined across the forehead by a 

 strongly developed band, if we regard the high convex lappet between the 

 ears, but not distinctly joined to them, in Chcerephon (Lophomops) abce as 



