THE FAMILIES AND GENERA OF BATS. 
53 
without supplemental cusps; crowns of larger cheekteeth subquad- 
rate in outline, the median groove, as in Ptenochirus , less distinct 
than in Cynopterus. General form of skull as in Cynopterus and 
Ptenochirus . 
Species examined. — Balionycteris maculatus (Thomas). 
Remarks. — The only known species of this well-characterized 
genus is further recognizable by its excessively small size (forearm 
only 41 mm.) and by the conspicuous yellowish spotting of the wings. 
1899. Thoopterus Matschie, Flederm. des. Berliner Mus. fiir Naturk., p. 77 
(part). 
1906. Sphwrias Miller, Proc. Biol. Soc. Washington, XIX, p. 83, June 4, 
1906. 
Type-species. — Cynopterus blanfordi Thomas. 
Geographic distribution. — Burma. 
Number of forms. — The type-species. 
Characters.— Like Cynopterus , but without calcar and external 
tail; incisors with conspicuously developed, sharply pointed, cut- 
ting edges. Dental formula, as in Cynopterus: 
Cheek teeth and canines as in Cynopterus, except that the canines 
show no trace of secondary cusps. Incisors better developed than 
in any of the related genera, and of conspicuously different form. In 
Cynopterus the cutting edge of the lower incisors is flat, though 
divided by a shallow emargination into two faintly indicated equal 
lobes. In Sphcerias the outer lobe is practically absent, and the inner 
lobe is elongated and sharply pointed, so that the series of teeth, 
when viewed from in front, shows four conspicuous serrations instead 
of six low, ill-defined points, or four rounded or flattened surfaces. 
The upper incisors are even more peculiar, the crown being sharp 
edged and angular, well differentiated from the shaft, and having 
a large main cusp near the middle. Skull as in Cynopterus. 
Species examined. — Sphcerias blanfordi (Thomas). 
Remarks. — The type and only known species of this genus was 
placed by Matschie in Thoopterus , but is strikingly different from 
all of its allies, particularly in the absence of the calcar, the very 
narrow interfemoral membrane, and the remarkably developed in- 
cisors. Though perhaps most nearly allied to Cynopterus , its rela- 
tionships to the genera of the group to which it belongs can not be 
regarded as very intimate. 
Genus SPHCERIAS Miller. 
- 2 3. 1. - 2 3 4 5 - - . 2-2 
1 2 1. - 2345 6- * 2-2’ 
