A MONOGRAPH OF THP: BATS OF NORTH AMERICA. G3 



thirds, apical third, whit(\ Tlie arm at its basal tliird black. Tlie 

 extent of the white portion (linuiiishes from above downward. Mem- 

 branes everywhere naked. 



iSh-uil. — Brain-case, low, quadrate, the height one-half the bimastoid 

 diameter. The metencephalon as long as mesencephalon and pro- 

 encephalon. Sagittal crest rudimentary, does not extend beyond a line 

 answering to the middle of the zygoma, the remaining- portions of the 

 posterior temi»oral crest widely separated; the anterior not defined. 

 Dorsum of face vertex with a shallow concavity which is not sharply de- 

 fined; orbit with inflated inner wall and rugose elevated apper border; 

 lachrynnil tubercle marked. Infraorbital canal short; the foramen on 

 line with interval between second i^remolar and first molar. Line of 

 the upper margin of the anterior nasal aperture if produced would in- 

 tersect the second premolar; tympanic bone apparently incomplete 

 above. 



The paroccipital process bold, trenchant; sterno-mastoid impression 

 deeply concave; mastoid comi)osed entirely of sijuamosal element. 

 Zygoma quite as in Goriinorhinm — the squamosal i)art twice as Avide 

 as maxillary; sphenopalatine foramen present, of large size. Occipital 

 crest trenchant. Tym^ianic bone greatly inflated, equals one-third the 

 length of the skull, not toucliing basioccipital, or basisphenoid; exca- 

 vate anteriorly. It extends to a line which answers to the middle of 

 the glenoid cavity. The mesopterygoid fossa as long as one-third the 

 distance from the posterior jialatal border to the incisors. The sphen- 

 oidal foramen is at the bottom of a deep recess. The coronoid process 

 is round, small, raised scarcely one-third the height of the ascending 

 ramus; lower border of the horizontal ramus near tlie angle slightly 

 concave. The angle is raised from the plane on which the mandible 

 rests. Atlas with large foramen for vertebral artery which rests on a 

 mere thread of bone; transverse process semicircular without spine. 

 In common with other cervical vertebra^ the tuV)eich' on anterior surface 

 of body is marked. Ribs twelve in number. Both [)resternum and 

 mesosternum keeled. Scapula much as in Corynorhinus. It was mu- 

 tilated in the single specimen examined. 



Maxillary teeth. — Incisors contiguous, slightly inclined toward the 

 med ian line, but the lateral tooth separated from the canine by a moderate 

 interval. Central incisor cuspidate with a small cus])ule projected mid- 

 way on the i)osterior surface; a distinct cuspule also arises from tlie 

 cingulum posteriorly. Lateral incisor one-half the size of the central, 

 and cuspidate, with a small cnspule arising from the cingulum on the 

 anterior and a second on the ])osterior j)ortion. Caninenot larger than 

 the second premolar, the buccal surface is abruptly convex. The first 

 premolar is small not wedged in, with complete cingulum. The space 

 between it and canine narrower than that between it and second pre- 

 molar. The second i)remolar as long as the Conine i^ud slightly fluted, 

 Molars as in Cort/iiorhinmr 



