A MONOGRAPH OF THE BATS OF NORTH AMERICA. 135 



narrow concave in line with longitudinal axis of tooth row; borders 

 abrubtly raised, thin, Siiiiile i)reniolai' not distinctive. The Vs of the 

 lirst an<l second molar sul)e([ual; tlie i)rotocone with obscurely defined 

 posterior commissure whicli ends at the apex of the second V. The 

 heel is rudinu^ntal, its apex appearing on the top of the protocone. 

 The third molar with protocone as in the other molars, but the posterior 

 limb ot the second V absent. 



MandihnJar teeth. — The incisors crowded. First with tritid cutting 

 edge, more inclined forward than the second and third, which are blunt, 

 thick, and bearing a mere nodule on the cutting surface. Canine with 

 broad concave posterior and narrow concave lingual surface, the two 

 separated by a sharp longitudinal flange. The heel like base, low and 

 broad. The first premolar wedged in tooth row by tlie basal lines of 

 the adjacent teeth; much smaller than the second, with the lingual 

 cingulum angulated. The second premolar with anterior basal cusp 

 on lingual part of the cingulum advanced. The first and second 

 molars not distinctive. The third molar with a small deflected heel, 

 which, while triangular, is much compressed from without inward. 



Kotes on the sl-eleton. — Atlas with minute spine from the transverse 

 lamina; the lower of the two forameii not seen from in front. Axis 

 without lateral oblique spine. 



Scapula with thin axillary border; triceps impression without rugos- 

 ity or spine; the superior angle scarcely inflected; tip of the coracoid 

 process is broader than the base and is deflected toward the vertebral 

 border. Humerus with internal tuberosity not higher than head and 

 of about the same size as the external tuberosity. Ulna in some spec- 

 imens anchylosed to radius at proximal end. Apparently attached to 

 this bone about at distal third of the shaft, but in fact ending free as 

 as in Adelonycteriii, Vesperugo, and VespertiUo. The distal end with 

 square perforated lamina. Innominate bone with narrow subrouuded 

 ilium not expanded above. Proximal end of tibia with large spine 

 The first metacarpal bone equals the phalangeal series in length. 



Sexual characters. — The proportion of the sexes could not be deter- 

 mined by the inaterial available. Many of the specimens examined (all 

 of those from Carlisle, Pa., N. M.) were lactating females, while of the 

 nine specimens in the Museum of Comparative Zoology seven were males. 

 The penis (see specimenNo. 1185, Cam. from Seabrook Island, South Caro- 

 lina) is long (8™'"), pendulous, cylindrical, and without exj)anded [)repuce. 

 In this respect the parts are (juite dissimilar to A. fuscus and closely re- 

 semble Atalapha. Testis on side of base of tail. 



The brain. — The flocculus of the cerebellum not projected. The an- 

 terior portion of cerebrum (rhinocele) abruptly constricted from the 

 pyriform fignre of the liemis])here. 



If((hitat. — This species has not been recorded in the United States 

 in regions beyond the South Atlantic slo])e and the country extending 

 west to the Mississippi and north to the Middle States as far as Penn- 

 sylvania. One specimen was formerly in the Smithsonian Institution, 



