74 CHRYSOPTERON BARTELSII, 
of the second upper premolar, it is evident that Weber’s 
and Bartels’ bat cannot be brought under one of the 
named or other existing genera. I propose to create for 
their reception a new genus, Viz.: 
Chrysopteron, n. g. 
ys 
tal f ia Ce pie aw 
Dental formula: 7 OTP 323 
Braincase normal; second upper premolar very small 
and not to be seen from without; middle and second lower 
incisors with four cusps. 
Type of the genus is Weberi Jentink. 
Bartels’ bat being distinct from Weberi, I describe it as: 
Chrysopteron Bartelsti, n. sp. 
Our new species is larger in all dimensions than Weberi; 
the orange color is broader along the fingers, meanwhile 
the black of the membranes is of a deeper tint, and the ears 
are more broadly bordered with black. 
Tragus and ear like in Weberi; wings closer to the base 
of the toes than in that species; projecting tip of tail 
shorter than in Weberi; in the latter the calcaneum ends 
free — cf. Tab. XI in Weber's ,Ergebnisse’ — mean- 
while in Bartelsii there is no free projection of calcaneum; 
like in Weberi so in Bartelsii the membranes and extre- 
mities are almost quite naked. 
Dentition almost as in Weberi; middle upper incisors in 
both species with a well-developed internal rather sharp 
cusp, in Weberi moreover the other upper incisors too 
have such an internal well-developed cusp, not to be ob- 
served in Bartelsii; canines strong, especially the upper 
ones; like in Weberi the small second upper premolar is not 
to be seen from without, but internal, and very small com- 
pared with the so well developed anterior upper premolar ; 
anterior and second lower premolars of about the same 
size as in Weberi, the anterior one in Bartelsii, however, is 
INotes from the Leyden Museum, Vol. XXXII. 
