A MONOGRAPH OF THE BATS OF NORTH AISIF^RICA. 51 



cave oil anterior surface. The first premolar uiuch smaller than second, which 

 bears a email denticle on the posterior border. The uietacone cremulate on the 

 posterior l)or(ler. The posterior border is excavated to a point opposite the first 

 molar. The mandilmlar first i>remolar is smaller than the second. The first iiremolar 

 is smaller than the second. The first molar ■svith four simple cusjjs, the second with 

 three; all arc simi)le and nearly coequal. 



Sturni7-a — The first maxillary premolar as large as second, not compressed from 

 before backward. The maxillary first and second molars tritul)ercular, no trace of 

 bypocone. I'aracone with a double contour lino on concave simple grinding surface. 

 Third molar bicuspidate. The first mandibular premolar much wider than second, 

 but of the same height. The first molar larger than second. Paracone is simple, 

 conoidal, marginal with cuspidate commissure so high on lingual border as to re- 

 semble a distinct cusp; endoconid same a paracouid. These three cusp-like points 

 are visible from lingual aspect of tooth. Hypoconidscarely smaller than protoconid 

 but not conoidal. Third molar obscurely tritubercnlar. 



BrachyphijUa. — Large posterior basal cusp on posterior border of canine; first pre- 

 molar minute entirely outside of axis of tooth-row. Second premolar Avith well de- 

 fined palatal basal lobe (protocoue) which is continuous with tiutings which extend 

 to apex of conoidal crown which aluiost reaches level of canine. First molar slightly 

 smaller than second; tritubercnlar protocone oblique with intermediate cusp between 

 it and metacone. Paracone and metaione sulicqual (the former being the larger) 

 sectorial and irregularly fluted on palatal sides. Second molar as first but the prot- 

 ocone is straight, i. e., parallel to buccal border, no intermediate cusp on crown but 

 a large marginal cuspule on buccal side between the sube(iual paracone and meta- 

 cone (the latter being the larger.) The third molar one-half the size of the first 

 with well defined anterior and po.sterior commissures. The mandibular ijreniolars 

 Bubequal, the posterior with a longer heel. The mandibular molars quadrituber- 

 cular, cusps well defined, crown not excavate. 



Xofes on the sJieJeton. — Atlas with inconspicuous or uo tubercle on 

 body. iSTo spines on tlie lower border of the transverse process. 



Axis with very small transverse process, which bears no foramen to 

 outside of the foramen for the vertebral artery'. No tubercle on the 

 keel on the ventral aspect of tlie centrum. 



Scapula. — The coracoid process scarcely curved and the free end not 

 reaching a point below the level of the glenoid cavity. The free end of 

 the spine angulated. The infra-spinous fossa slightly deepened at the 

 axillary border. The inner tubercle of the humerus slightly raised 

 above the head, 



Humerm. — Theconvexity of the trochlea well defined, broad in front; 

 median concavity deeper behind than in front; the same is true of the 

 limiting ridge; the lateral concavity is weak and not produced back of the 

 longitudinal axis of the humerus. Ei)icondyle horizontal, conspicuous; 

 no spine on the under surface; no median pit on the shaft beneath the 

 epicondyle. 



The radius with a spoon-shaped distal articular surface with mark- 

 edly-developed side flanges. The biceps impression o('cui)ies entire lat 

 eral surface of the shaft. The surface for articulation of the ulna is 

 broad above, narrow below, and is throughout irregular. 



The proximal rudiment of the ulna is free at the olecranon, but 

 anchylosed with the radius a little above the middle of the shaft. The 

 distal rudiment is a small, hatchet- shaped tubercle. 



