76 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



1899. Gelasinus Matschie, Flederni. des Berliner Mus. fiir Naturk"., p. 81. 

 1899. Bdelygma Matschie, Flederm. des Berliner Mus. fiir Naturk., p. 82 



(subgenus for Harpyia major Dobson). 

 1902. Nyctimene Thomas, Proc. Biol. Soc. Washington, XV, p. 198, October 



10, 1902. 

 1905. Nyctymene Thomas, Proc. Zool. Soc. London (1904), p. -188, April 



18, 1905. 



-Type-species. — Vespertilio cephalotes Pallas. . . 



Geographic distribution. — From Celebes and Halmahera to the 

 Bismarck Archipelago and northern Australia. 

 Number of /wms.^Six forms of Nyctymene are now known. 

 Characters. — Dental formula : 



-2-. 1.-2345--. 1-1 1-1 3-3 1-1 .. 



---.1.-23456- * 0^0' ° T=V P m 3^3' m ¥^2= M - 



Incisors large, completely filling space between canines, their crowns 

 subterete and distinctly marked off from shafts by well-developed cin- 

 gula ; cutting edge well developed, notched near outer side. Canines 

 (Plates VII, VIII, fig. 2) strong and rather short, their anterior sur- 

 face smoothly rounded, the lower simple, in contact just above cingu- 

 lum, their tips slightly diverging, the upper with well-developed sec- 

 ondary cusp usually present, though this occasionally (N. robinsoni) 

 represented by a mere thickening of the enamel. Small premolar 

 (pm 2 and pm 2 ) well developed, its crown terete and slightly flat- 

 tened, the tooth just equal to cingulum of canine in height. Second 

 lower molar like small premolar, but crown nearly double as large 

 and obscurely quadrate in outline. Other cheek teeth (pm 3 , pm 4 , 

 pm 3 , pm 4 , m 1? and m 2 ) essentially alike in form, those in each jaw 

 gradually diminishing in size from before backward, the median 

 groove deep but much distorted by the large anterior cusps which 

 are so developed as to obliterate most of the horizontal surface of the 

 crown except in the upper molar and first lower molar; inner cusp 

 showing a distinct tendency to become terete, especially in pm s and 

 pm 3 , and outer cusp, except in pm * and m 1 , tending to be bifid. 

 Skull short and heavy, the distance from orbit to nares less than 

 lachrymal width; brain case narrow and very little deflected, the 

 alveolar line projected backward, passing about through condyle; 

 occiput not tubular ; audital bullae better developed than in Pteropus, 

 but less so than in Gynopterus ; mandible practically without angular 

 process. Externally characterized by presence of well-developed tail 

 a claw on index finger, conspicuously tubular nostrils, and attachment 

 of wings low on sides of body and to bases of second and third toes. 



Species examined. — Nyctymene cephalotes (Pallas), N. major 

 (Dobson), N. albiventer (Gray), N. aello Thomas, N. robinsoni 

 Thomas, and N. hdlulce Thomas. 



