54 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



Genus ROUSETTUS Gray. 



1821. Rousettus Gray, London Medical Repository, XV, p. 299, April 1, 



1821. (wgyptiacus.) 

 1829. Cercopteropus Burnett, Quart. Journ. Sci. Lit. and Art, XXVII, p. 



269, April-June, 1829. (wgyptiacus, amplexicaudatus.) 

 1843. Xantharpyia Gray, List Spec. Mamrn. Brit. Mus., p. 37. (amplexi- 



caudata. ) 

 1843. Eleutherura Gray, Voyage of the Sulphur. Mamm., Pt. 2, p. 29. 



(Pterop'us hottentottus Temminck=P. collaris Illiger.) 

 1852. Gynonycteris Peters, Reise nach Mossambique, Zool., I, Saugeth., p. 



25. (collaris.) 

 1870. Senonycteris Gray, Catal. Monkeys, Lemurs, and Fruit-eating Bats, 



Brit. Mus., p. 115. (Pteropus seminudus Kelnavt= Rousettus am- 



plexicaudatus.) 

 1878. Gynonycteris Dobson, Catal. Chiropt. Brit. Mus., p. 70 (part). 

 1899. Myonycteris Matschie, Plederm. des Berliner Mus. fur Naturk., p. 63. 



( torquatus. ) 

 1899. Xantharpyia Matschie, Plederm. des Berliner Mus. fur Naturk., p. 65. 

 (brachycephala, brachyotis, wgyptiaca, collaris, amplexicaudata.) 



Type-species. — Pteropus wgyptiacus Geoffroy. 



Geographic distribution. — Africa; Southern Asia to the Hima- 

 layas; Malayan region to the Philippines; New Guinea, Bismark 

 Archipelago, Solomon Islands. 



Number of forms. — Eight species are currently recognized. 



Characters. — Dental formula : 



-2 3. 1. - 23 456- .2-2 1-1 3-3 2-2 



12-. 1. -234567 % 2^2' ° 1=?*™ 3^3' m 3^3 =M - 



Teeth essentially as in Cynopterus, but cheek teeth with cusps, 

 ridges, and grooves less strongly developed. Upper incisors low, 

 widely spaced, the central pair not higher than the outer teeth, 

 the crowns bluntly rounded but distinctly differentiated from shafts ; 

 lower incisors with front surface marked by a groove which in some 

 species is so deep as to produce distinct emargination of the cutting 

 edge. Skull (fig. 7) differing from that of Cynopterus in the slightly 

 greater deflection of the occipital region, the alveolar line projected 

 backward, passing through middle of occiptal condyle, and in the 

 longer rostrum (distance from orbit to nares greater than lachrymal 

 breadth) . External characters essentially as in Cynopterus, but muz- 

 zle less shortened. Second finger with well-developed claw; tail 

 and calcar present. 



Species examined. — Rousettus wgyptiacus (Geoffroy), R.amplexi- 

 caudatus (Geoffroy), R. philippinensis (Gray), R. collaris (Illiger), 

 R. brachyotis (Dobson), and R. torquatus (Dobson). 



Remarks. — As here understood the genus Rousettus includes the 

 forms placed by Matschie in the subgenera Rousettus and Myonycteris. 



