52 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Characters .- — Like Ptenochirus , but with no visible tail and with 
rostral portion of skull strongly concave both dorsally and laterally. 
The peculiar concave dorsal profile is shown in Matschie’s figure.® 
In this skull the rostrum is also concave laterally, or perhaps the form 
might be better described as deeply compressed in and below the 
mid-nasal region. 
Species examined.— M eg cer ops ecaudatus (Temminck) from Bor- 
neo. 
Remarks . — -Though Meg err ops has been generally regarded as a 
subgenus of Cynopterus , and Matschie has placed it under Ptenochi- 
rus , I think that it may more naturally be allowed to stand as a dis- 
tinct genus. By the tooth formula and the character of the cheek 
teeth it is rather closely allied to Ptenochirus , but the absence of any 
external tail and the peculiar form of the rostrum sufficiently differ- 
entiate it. 
The type of u Cynonycteris ” grandidieri Peters, which I have ex- 
amined in Paris, someAvhat closely resembles Megcerops in the form 
of the rostrum (see Matschie’s plate already referred to), but differs 
from this genus in the presence of 2-2 lower incisors. As Matschie 
suggests, 5 the supposed m 1 and m 2 are the two roots of the single 
molar tooth, the crown having been entirely worn away. In the 
lower jaw the anomalous “ m 2 ” and “ m 3 ” are likewise the remnants 
of the normal second molar. The animal had, therefore, the dental 
formula of Cynopterus. In its bad condition, however, the structure 
of the teeth being quite obscured by their excessive wear, I prefer not 
to attempt to assign the species to any genus. 
Genus BALION YCTERIS Matschie. 
1899. Balionycteris Matschie, Flederm. des Berliner Mus. fur Naturk., p. 80. 
( maculatus .) 
T ype- species. — Cynopterus maculatus Thomas. 
Geographic distribution. — Borneo. 
Number of forms. — One, the type species. 
Characters . — Like Ptenochirus , but without external tail and with 
5-5 upper cheek teeth. Dental formula : 
- 2 3. 1. - 2 3 4 5 6 - . 2-2 1-1 3-3 2-2 OA 
- 2 1. - 2 3 4 5 6 1-1’ 1-1 ’ pm 3-3’ m 2-2 -30 ' 
Teeth closely resembling those of Ptenochirus except for the pres- 
ence of the minute second upper molar. Incisors styliform ; canines 
« Die Flederm. des Berliner Mus. fur Naturk., pi. [viii], fig. 5. It is even more- 
pronounced in a Bornean specimen in the British Museum (No. 95.10.4.1, Kina 
Balu, John Whitehead). 
& Die Flederm. des. Berliner Mus. fur Naturk., p. 71. 
