160 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



and less compressed, the posterior basal swelling marked in all. The 

 canine slightly inclined backward, concave on posterior surface. The 

 cingnlum entire. The i^remolars unequal, the first much the smaller. 

 The first and second molars with the anterior limb of the heel joining 

 the smaller V at about the middle of the posterior limb. The commis- 

 sure on the lingual surface of the heel oblique from behind forward. 

 The third molar with a scarcely triangular heel, wbich is smaller than 

 the V, blunt, compressed. 



Notes on the skeleton. — Atlas with sharply produced downward trans- 

 verse process, which bears a single foramen. The process back of the 

 transverse process of the presternum equals the length of the process 

 in front of the same. The mesosternum scarcely crested. 



The coracoid process of scapula does not reach to the middle of the 

 glenoid cavity. The end of the process is twice the width of the base; 

 the long i)rocess from the scapula spine is greatly curved, and is ab- 

 ruptly widened in the middle. The axillary border rese ibles that in 

 MoJossus riifus in being straight for over half its length, and in be- 

 ing thence gradually inclined outward. The upper border is at the 

 superior angle, furnished with a conspicuous spine, which projects to- 

 ward the glenoid region and lies below the level of the base of the 

 corocoid. The infraspiuous fossa is without ridge between the sur- 

 faces for the infraspiiuitus and teres minor muscles; a ridge lies in tlie 

 subscapular fossa. A facet is seen on the axillary side of the acro- 

 mion. The clavicle is stouter than in most bats of the size and is more 

 curved than in Artiheus, with which it answers in general size. 



The humerus with internal tuberosity much higher than the head. 

 The radius is about one and a half times as long as the humerus. The 

 proximal border is produced so as to partake of the olecranoual func- 

 tion of supporting the elbow posteriorly; on the articular surface a 

 deep, narrow groove is bounded by flanges. The distal end with a 

 broad, thin process on the flexor surface directed downward and in- 

 Avard. The outer border is produced, truncate, and appears on the un- 

 der surface of the bone. The proximal ulnar rudiment does not extend 

 distally beyond the lower border of the depression for the insertion of 

 the bicei)s muscle; the distal ulnar rudiment is provided with a groove 

 for the flexor tendons. 



The carpus does not possess characters distinct from A. novebora- 

 censis. The third metacarpal bone with two grooves entire length on 

 one side and one groove on the other. 



The first phalanx of the second finger one-fifth the length of the cor- 

 responding metacarpal bone. The second phalanges of the third and 

 fourth fingers are slightly longer than the first. 



The fifth digit varies slightly as compared with the length of the 

 forearm. No. 5284, U. S. N. M., Nebraska; it lacks one-fifth (/. f., li) 

 of being as long as the forearm. In No. 3215, U. S. N. M., it lacks but 



