THE FAMILIES AND GENERA OF BATS. 
205 
Teeth strictly normal and not differing in any essential features 
from those of Myotis and Lasionycteris , except in the absence of both 
pm 3 and pm 3 . Outer upper incisor not as large as inner, but extend- 
ing considerably beyond its cingulum. Inner upper incisor simple, or 
more often with a well-developed secondary cusp. a Canines usually 
rather stout, the posterior cutting edge of upper tooth often, though 
not invariably, with incipient secondary cusp. Anterior upper pre- 
molar barely or not in toothrow. Other teeth with no special peculi- 
arities. Skull (fig. 32) essentially as in Myotis , though with a tend- 
ency to greater breadth. External charac- 
ters not essentially different from those of 
Myotis , but ear usually shorter and broader, 
and tragus less acutely pointed ; in some spe- 
cies bent forward at tip. 
Species examined. — About half the known 
species have been examined. 
Remarks. — As stated by Flower and 
Lydekker, the coracoid in Pipistrellus is bi- 
fid at tip, though very slightly. It differs 
further from that of Myotis in its much 
slighter curvature. The members of the 
genus are recognizable by their dental for- FlG - 32.— pipistrellus pipistrel- 
mula, large outer upper incisor, unmodified 
skull and ears, and the normally long fifth finger. The species are all 
small, some of them the smallest of known bats. 
Genus GLISCHROPUS Dobson. 
1875. Glischropus Dobson, Proc. Zool. Soc. London, p. 472 ( nanus and tylo- 
pus). Subgenus of Vesperugo. 
1878. Vesperugo Dobson, Catal. Chiropt. Brit. Mus., p. 183 (part). 
Type-species. — Vesperugo tylopus Dobson. 
Geographic distribution. — Borneo and Batchian. 
Number of forms. — This genus, as here understood, contains the 
species tylopus Dobson and batchianus Matschie and krefftii Peters; 
nanus , although referred to it by Dobson, proves to have the teeth 
of true Pipistrellus. 
Characters. — Externally like Pipistrellus , but with the callosities 
on sole of foot and ball of thumb usually more developed. Teeth 
as in Pipistrellus except- that outer upper incisor is forced outward 
from the toothrow and so turned that its convexity is directed out- 
ward instead of backward. 
Species examined. — Glischropus tylopus ( Dobson 1 and G. krefftii 
(Peters). 
a This cusp is present in Pipistrellus abramus, P. eeylonicus, P. ghrysothrix , 
P. imbricatus, P. Jcuhlii, P. mimus, P. murrayi, P. papuanus, P. pipistrellus, and 
P. raptor. It is absent in P. ariel, P. crassulus, P. deserti, P. hesperus, P. nanus , 
P. nanulus, P, ridleyi, and P. subflavus. 
