A MONOGRAPH OF THE BATS OF NORTH AMERICA. 139 



Th(> mandibular incisors crowdtMl; the iirst incisor iinicli larger than 

 the coequal second and third teeth; cuttinji- edge triftd and palatal 

 base produced; the second and third rounded, conoid, and blunt; they 

 are made obscurely bifld in front; the first premolar not more than half 

 the size of the second; the molars quite as in other species. 



>ll:i(II. — The greatest length is 17""". The length of meseiu:ephalon 

 is ")"'"'. The greatest width is 10"'°'; the least width 5"'"'. A delicate 

 sagittal crest extends the entire lengtli of the metencephalon and lialf 

 way over the mesencephalon. The posterior temporal crests are almost 

 parallel with each other over the posterior half of the mesencephalon 

 near the dorsal median line, leaving a conspicuous space which is the 

 homologue of the triangular interval in other genera. The anterior 

 temporal crest is well defined and ends on the orbital crest. The 

 paroccipital process is large, conical directed, backward, and its line 

 intersects the condyle above its center. The mastoid process is 

 slightly produced, but less so than is the paroccipital. The intermediate 

 space is scarcely convex and deeply incised. The tympanic bone is 

 complete. Xo tubercle lies above the proencephalic foramina.. The 

 orbital crest is small and is placed well forward and involves the lach- 

 rymal bone. The infraorbital canal is placed high above the teeth; is 

 exceedingly short, permitting a mere rim of bone to lie between the 

 orbital and the facial foramen. The lachrymal foramen is inconspicu- 

 ous, almost concealed in profile. The line produced from the upper 

 border of the anterior nasal aperture intersecting the first molar. The 

 fron to-maxillary inflation moderately developed and is best defined at 

 the lachrymal region. The lingual process reaches the tympanic bone. 

 The tympanic ring is complete. The zygoma is without elevation on 

 the upper border. 



The coronoid process is not as high as is the horizontal ramus. The' 

 masseteric impression is weak inferiorly and not quite reaching tlie 

 lower border of the horizontal ramus. It scarcely impresses the coro- 

 noid. The angle torms a fiat quadrate process, deeply concave on 

 median aspect and extends scarcely beyond the condyle. As seen 

 from above, it lies in line with the middle of the condyle. The poste- 

 rior symphysal spine is conspicuous. 



N^otes on the sTceleton. — The triceps impression of the scapula bends 

 more to dorsum than to venter. The glenoid is absolutely straight on 

 median surface excavated above on lateral but very convex inferiorly 

 on same side. The infra-spinous portion of venter with a stout ridge 

 ranging downward and backward from the compact tissue at glenoid. 

 This ridge answers to the concavity on dorsum. In both human and 

 bat scapula the stoutest ridge on venter answers to the deepest concav'- 

 ity on dorsum. In the human variety this lies near the axillary border; 

 in the bat at middle of the dorsum, 



Rahitat. — Mexico and the Gulf States, It is a rare si)ecies and 



