ON THE GLOSSOPHAGIN#. 251 
the mental groove furnished with an obscure row of minute warts and the chin beyond 
the groove thickened with gland clumps. 
Fur short, villose, longer on neck, above deep ash verging to gray, base white, below 
paler. On neck, basal part tawny, but abdomen almost unicolored. The hair is slightly 
whiter at pubis. Distal half of humerus (above and below) hairy—the rest of the limbs, 
except the base of thumb, second digit and all of dorsum of foot, covered with a sparse 
growth of short hair. 
The muscle fascicles on wing membrane are much the same as in Phyllonycteris. 
They are wide apart generally, but do not extend over so large a field. The reticulated 
arrangement of fibres near the forearm is conspicuous. The longitudinal lines in the 
third and fourth interspaces distinct. The nerve markings are characteristic. Both arise 
from the digits far above the joint, the anterior being at distal third of the fourth meta- 
carpal bones. 
The terminal cartilage of the fourth digit scarcely spatulate ; that of the fifth digit is 
terete and not free. In this respect Leptonycteris resembles the remote Phyllonycteris. 
The skin in the second interspace is not pigmented. 
The Skull—Skull not papyraceous ; proscencephalon not defined. The pretemporal 
crests subtrenchant and form a short, faint conjoined line with its fellow at the sagitta ; 
the scarcely discernible mesotemporal depressed, not reaching sagitta; pasttemporal reaching 
occipital crest. Face vertex with depression over ethmoid, but the nasal bones are scarcely 
defined in median line and not separated at all laterally from the concave sides of the 
face. Fronto-maxillary inflation barely discernible and crossed by the orbital ridge. 
Alveolar process in height equals one-seventh the width of the neck of the upper canine 
and one-twenty-second the vertical diameter of the anterior nasal aperture. The depression 
between the lateral margin of the anterior nasal aperture and the root of the canine tooth 
much deeper than in Glossophaga soricina. Ascending process of zygoma rudimentary. 
The premaxilla weak in advance of the large incisive foramina ; posterior border near the 
zygoma root not spinose. The rounded notch at the mesopterygoid fossa midway between 
zygoma root and glenoid cavity. Scarcely any difference observed between the level of the 
basioccipital and the basisphenoid. The mastoid process acuminate. The tip of the 
pterygoid process in advance of the oval foramen. ‘The nasals are incised at the anterior 
nasal aperture. The angle of the lower jaw acute, not hamular; it is on the same plane 
with the masseteric impression, not separated therefrom inferiorly by a notch, and projects 
backward beyond the condyloid process. Symphysis not carinate. The lower border of 
the masseteric impression carried in a semi-circular line beyond the horizontal ramus. 
The Teeth—Teeth crowded for the most part. Upper incisors as in G'lossophaga 
soricina ; the central hatchet-shaped, separated by an interval. The lateral incisors as 
