52 BULLETIN 51, 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. — Megasrops ecaudatus (Temminck) from Bor- 

 neo. 



Remarks. — Though M'egcerops 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 " Gynonycteris " grandidieri Peters, which I have ex- 

 amined in Paris, somewhat 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, 6 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 /' and " m" 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 BALIONYCTERIS Matschie. 



1899. Balionycteris Matschie, Flederm. des Berliner Mus. fur Naturk., p. 80. 

 (maculatus.) 



Type-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.-23456- ' * 1=1' ° 1=1' Pm 3=3' m 2=2 =3 °- 



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. [vin], 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. 



