THE FAMILIES AND GENERA OF BATS. 53 



without supplemental cusps; crowns of larger cheek teeth 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. 



Genus SPH^ERIAS Miller. 



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: 



- 2 3. 1. - 2 3 4 5 - - . 2-2 1-1 irvm 3-3 1-1 _„ A 

 12"-. 1. - 2 3 4 5 6 - * 2=2' ' 1=1' P ™ 3=3' m 2^~ 6 °- 



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 Sphmrias 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. — Sphmrias 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. 



