108 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



infraorbital foramen is small and near the orbit. In the orbit the 

 corresponding foramen is large and without concavity about it. A line 

 produced from the upper margin of the anterior nasal aperture inter- 

 sects the dental arcli directly back of the canine tooth. The upper bor- 

 der of the zygomatic arch elevated. The paroccipital process is i)ro- 

 duced, but does not reach the level of the lower bor«ler of the occii)ital 

 condyle; it is longer than the mastoid. The region between it and the 

 mastoid is slightly inflated with a shallow incision inferiorly; it equals 

 one-ninth of the greatest length of the skull. The tympanic bone is not 

 complete above, the head of the malleus, as iu A. fuscus, appearing in 

 the interval and without an anterior basal process. 



A small post maxillary process is present. Basioccipital without lat- 

 eral concave depression. The sphenoidal tongue is conspicous, conceal- 

 ing the cochlea at the anterior half The posterior palatal spine is well 

 developed ; the vomer is reeedant. The height of coronoid process above 

 level of the condyle is less than the width of the horizontal ramus. 

 The interval between angle and condyle is rectangular. The sym- 

 l)hysis yields a small posterior process which ends opposite the second 

 premolar. 



Examination of the interior of the nose shows that the septotur- 

 biiial space extends a little in advance of the septal line. There is but a 

 single opening for the ectoturbinal. The main plate is marked by a 

 relativelj^ small opening, behind which extends a row of three small 

 foramina. On the nasal surface the endoturbinal series is inflated, 

 and does not exhibit the lateral concavity seen in other Vesper- 

 tilioiudte. It is directed downward and forward. The first endo- 

 turbinal is as in A. fiiscus. It reaches a i)oint as far as the canine 

 tooth, is slightly depressed above, and presents a uniformly sloj^ing sur- 

 face laterally. Its lower edge forms the lower border of the median 

 surface. The second endoturbinal is of uniform width, longer than 

 high, and equal in length to the free i)ortion of the first endoturbinal. 

 The third endoturbinal is smaller than the preceding. 



Maxillary teeth. — 'The median of the maxillary incisors is bifid on 

 the cutting edge, and so placed as to be obliquely lodged in the jaw, 

 the inner of the bifid points being directed outward. The lateral incisor 

 with a conical outer (labial) surface and a trenchant flange of nearly 

 the same length as the median aspect of the palatal surface. These 

 two parts are iu exact anteroposterior position to each other, thus 

 being in contrast with the oblique jjosition of the parts in the case of 

 the central tooth. The canine is concave on the palatal surface, the 

 trenchant border being in the line of the tooth axis; the labial sur- 

 face posteriorly is concave. The first premolar is very small, but edged 

 in the space between the outer and inner angles of the interval between 

 the canine and second premolar; the second i^remolar scarcely longer 

 than first molar with a sharp spine-like protoeone and low rounded heel; 

 the first and second molars with posterior commissure of the protoeone 



