1917.] 



Allen, Lang and Chapin, Bats from the Belgian 1 Congo. 



469 



morphologically a connecting ear-band. In the present species (repre- 

 sented by the single type specimen) there is not even a vestigial band, but 

 the position it should occupy if present is outlined by a line of slightly 

 lengthened dark brown hairs, giving the visual effect of a vestigial band 

 till it is carefully examined and found not to be a slight ridge of membrane. 



64. Mops trevori 1 sp. nov. 

 Plate XL VIII, Fig. 2. 



Type, No. 49250, 9 ad. in alcohol, Faradje, Sept. 29, 1912; H. Lang and James 

 P. Chapin. American Museum Congo Expedition. Orig. No. 1954. 



Pelage short, soft and fine, with the grayish sheen in certain lights seen in many 

 other molossid bats. 



Upperparts cinnamon brown, with the usual naked transverse zone across front 

 of shoulders; underparts pale brown, darker on the sides and lighter medially, with 

 the hairs of the pectoral region conspicuously tipped with grayish white; caudal end 

 of body not denuded, but with the projecting bristly hairs seen in allied forms. 

 Membranes and wing bones above blackish and naked, except for a small patch of 

 short brown fur near the center of the propatagium; below much lighter and the 

 wing bones whitish; naked portion of face and ears, and the naked hind limbs and 

 tail blackish; interfemoral membrane above blackish, below much paler, as is also 

 the ventral surface of the hind limbs. A low crest (the hairs about 5.5 mm. in length) 

 arises from the back of the membrane connecting the ears and extends back over the 

 front half of the interaural area and the basal half of the backs of the ears. TJie 

 crest area is of the same color as the surrounding pelage. 



Total length, 121.5 mm.; head and body, 82.3; tail, 39.2 (free portion 24); 

 forearm, 53; third metacarpal, 53.5; thumb to base of pad, 8.4; tibia, 20; foot, 

 13.6; ear from notch, 20; breadth (near front border), 12; tragus minute, quadrate, 

 2 X 1.5; antitragus convex, broad at base and low, 6.5 X 4. 



Skull, total length, 24.2; condylobasal length, 22; zygomatic breadth, 14.6; 

 interorbital breadth, 5; mastoid breadth, 13.8; maxillar breadth, 10.4; breadth at 

 base of canines, 7; upper toothrow (c-m 3 ), 8.6; length of mandible, 15.8; angle to 

 condyle, 5.2; depth at coronoid, 4.5; lower toothrow, 9.7. 



Represented only by the type. 



- Mops trevori is of nearly the same size as M. congicus, but it is slightly 

 smaller in all measurements, except that the ears are larger. The coloration 

 is radically different, the upperparts in congicus being deep chestnut, and 

 dull cinnamon brown in trevori, with still greater difference in the color of the 

 underparts. It differs from M. midas in much smaller size, while the color 

 of both upperparts and the ventral surface in the two species is as different 

 as between trevori and congicus. In cranial characters trevori is too differ- 

 ent from either congicus or midas to render comparison necessary. 



1 Named for John B. Trevor, a Trustee of the American Museum of Natural History and Chair- 

 man of the Committee on African Exploration, whose enthusiasm and generosity in support of the 

 Congo Expedition contributed greatly to its success. 



