54 
BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Genus ROUSETTUS Gray. 
1821. Rousettus Gray, London Medical Repository, XV, p. 299, April 1, 
1821. ( cegyptiacus .) 
1829. Cercopteropus Burnett, Quart. Journ. Sci. Lit. and Art, XXVII, p. 
269, April-June, 1829. ( cegyptiacus , amplexicaudatus.) 
1843. Xantliarpyia Gray, List Spec. Mainm. Brit. Mus., p. 37. ( amplexi - 
caudata.) 
1843. Eleutherura Gray, Voyage of the Sulphur. Mamm., Pt. 2, p. 29. 
( Pteropus hottentottus Temminck=P. collaris Illiger.) 
1852. Cynonycteris 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 Kelaart =Rouseitus am- 
plexicaudatus.) 
1878. Cynonycteris Dobson, Catal. Chiropt. Brit. Mus., p. 70 (part). 
1899. Myonycteris Matschie, Flederm. des Berliner Mus. fur Naturk., p. 63. 
( torquatus . ) 
1899. Xantharpyia Matschie, Flederm. des Berliner Mus. ftir Naturk., p. 65. 
( brachycephala , brachyotis, cegyptiaca, collaris, amplexicaudata.) 
Type-species. — Pteropus cegyptiacus Geoff'rov. 
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.- 2 3 4 5 6 - .2-2 1-1 3-3 2-2 _ 
1 2 1. - 2 3 4 5 6 7 * 2 - 2’ 1 - V pm 3 - 3 ’ m 3 - 3 _34 ‘ 
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 ; 
iower 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 cegyptiacus (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. 
