400 PROCEEDINGS OF THE ACADEMY OF [^lay, 



hairs causes it to disappear. Ears and membranes browu, not as 

 dark as in Vanipyrops vittatus, the only large species at hand. 



Skull and Teeth. — The skull is considerably smaller than that of 

 Vampyrops vittatus, but not noticeably different in form, excei>t 

 that the interorbital region is narrower and more distinctly concave. 

 Anterior nares a little mo'-e produced backward than in the larger 

 species. 



Teeth as in V. vittatus, bul uuilormly much smaller, the outer 

 upper incisors excepted. These are actually as well as relatively 

 larger than in the larger animal. 



Measurements. — External measurements of type (from skin) : 

 Head and body, 70; tibia, 24; foot, 13 (12); forearm, 56; 

 thumb, 17; second digit, 4fi; third digit, 130; fourth digh, 93; 

 fifth digit, 88; ear from meatus, 19; width of ear, 11.4. 



Cranial measurements of type: Greatest length, — (30) ;" basal 

 length, — (28); basilar length,- — (24.4); median palatal 

 length, 16 (16.6); interorbital constriction, 7 (7.6); zj^gomatic 

 b.'-eadth, 18 (19); mastoid breadth, — (16); breadth of palate 

 between middle molars, 8 (8.4) ; mandible, 21.8 (22.4) ; maxillary 

 toothrow ((Exclusive of incisors), 12 (12.6); front of canine to 

 back of second molar, 11.6 (12); mandibular toothrow (exclusive 

 of incisors), 13 (13. 4).''^ 



Specimen Examined. — One, the type. 



Remarks. — This species is readily distinguishable from Vampyrops 

 vittatus by its smaller size, lighter color, and by the faintness of the 

 face markings and dorsal line. In size it approaches V. reeifinus 

 and V. infascus, though it is larger than either ; forearm, 56, as 

 opposed to 41 in V. reeifinus and 52 in V. infuscus. From the 

 latter it differs in the presence of the white dorsal line. The upper 

 incisors probably show the first suggestion of the form found in 

 Vampyrops zarhinus and V. reeifinus, as the middle pair are 

 smaller than in V. vittatus. They are, however, practically in 

 contact with each other, though with a lens a slight space between 

 them can be detected. 



" Measurements in parentlieses are those of an adult female Vampyrops 

 vittatus from Valparaiso, Santa Marta region, Colombia (No. 15,101, 

 Am. Mus. Nat Hist.), kindly loaned by Dr. J. A. Allen. 



'5 Some of the cranial measurements of the type of V. reeifinus given 

 by Thomas (Ann. and Mag. Nat. Hist., 7th ser., VIII, p. 193, Septem- 

 ber, 1901) are as follows ; Greatest length, 24 ; basal length, 19 ; front of 

 canine to back ot second molar, 8.4. 



