ON TEMMINCKRK’S BAT, SCOTOPHILUS TEMMINCKII. 
BY 
HarRRIsON ALLEN, M. D. 
Ihave recently examined this form with some care and find it in 
close alliance with the genera Atalapha and Dasypterus. The number 
of the teeth is the same as in the genus last named. Scotophilus pos- 
sesses but two upper incisors, placed at the sides of the canines. The 
upper molars possess a rudimentary hypocone. The shape and propor- 
tions of the last upper molar are almost precisely the same as in the 
atalaphines, viz., the tooth is composed of the anterior limb of the first 
V. Arudimental hypoconid characterizes the lower molars, and all 
cusps are blunted, 7. ¢., nonaciculate. The bicuspidate type of the 
‘much-crowded lower incisors is obscure in the first and second while 
ori : 
absent in the third tooth. The transverse ridge of the outer surface of 
the tragus, the shape of the external basal lobe of the auricle, and the 
proportions of the digits are similar in Scotophilus and the American 
genera, and the markings on the wing membranes are of the same 
character, although more simple in the former. The ulna, in being con- 
fined to a fixed proximal rudiment without shaft, is also identical. The 
distal ulnar rudiment is of the quadrate-perforate type instead of being 
uncinate, as in the atalaphines (occasional examples in A. noveboracensis 
excepted). The pisiform is elongate and lies alongside of the proximal 
end of the fifth metacarpal bone. 
Among the distinetive characters of Scotophilus, as compared with the 
Mi japhines, may be mentioned the following: The mastoid process is 
trenchant and bold, almost as much so as in Noctilio, where this disposi- 
tion attains its highest development. The temporal crest is high pos- 
teriorly. The nostril is circular and without disseptiment. The lower 
lip is provided with a triangular naked space, which is divided by a 
longitudinal groove. The thickened upper lip is separated from the 
muzzle by a faintly marked transverse groove. 
As compared with NVycticejus, there may be said to be a general resem- 
blance only. In Scotophilus the anterior palatal notch reaches a line 
which intersects the posterior margin of the premolar. The palate ex- 
tends back beyond the middle of the zygoma. In Nycticejus the anterior 
palatal notch reaches barely to the hinder border of the canine. The 
palate extends to the anterior third of the zygoma. In addition to 
these characters, and as contrasted to Scotophilus and the atalaphines, 
Proceedings National Museum, Vol. XV—No. 914, 
443, 
