THE FAMILIES AND GENERA OF BATS. 
63 
as in Pteropus. Posterior portion of brain case strongly tubular, and 
occipital region so deflected that alveolar line projected backward 
passes through root of zygoma. Audital bullse as in Pteropus. Ex- 
ternal characters as in Pteropus. 
Species examined. — Stylocienium wallacei (Gray). 
Remarks. — This genus is well differentiated from its allies by its 
peculiar dental formula and by the structure of the incisors and pos- 
terior cheek teeth. 
Genus DOBSONIA Palmer. 
1810. Cephalotes Geoffroy, Ann. Mus. cl’Hist. Nat. Paris, XV, p. 104 (part). 
1828. Hypoderma Is. Geoffroy, Diet. Class. cl’Hist. Nat., XIV, p. 706 (not of 
Latreille, 1825). 
1840. Hypodermis Blyth, Cuvier’s Animal Kingdom, p. 69. 
1878. Cephalotes Dobson, Catal. Chiropt. Brit. Mus., p. 91. 
1898. Dohsonia Palmer, Proc. Biol. Soc. Washington, XII, p. 114, April 30, 
1898. 
1899. Cephalotes Matschie, Flederm. des Berliner Mus. fur Naturk., p. 85. 
1902. Dohsonia Thomas, Proc. Biol. Soc. Washington, XV, p. 198, October 
10, 1902. 
Type-species. — Cephalotes peronii Geoffroy. 
Geographic distribution. — Celebes, Moluccas, New Guinea, Bis- 
mark Archipelago, Solomon Islands. 
Number of forms. — Three species are now recognized. 
Characters. — Differs from Pteropus in absence of claw of index 
finger, presence of well -developed tail, attachment of membranes 
along middle of back, and in the presence of only 28 teeth. Dental 
formula : 
- 2 - . 1 . -- 3456 - 
- 2 - .1. - 2 3 4 5 6 7 
1-1 
1 - 1 ’ 
c 
1-1 
1 - 1 ’ 
pm 
2-2 
3 - 3’* 
m 
2-2 
3-3 
=28. 
Upper incisors short, but well developed, in contact or nearly so, the 
crowns about as wide as long and with distinct cutting edge. Lower 
incisors almost structureless spicules with barely indicated blunt 
crowns. Canines rather short, not peculiar in form, without second- 
ary cusps, those of the lower jaw nearly in contact. No small upper 
premolar (pm 2 ). The corresponding tooth in the lower jaw is rela- 
tively larger than in Pteropus , and is not separated from canine or 
from first large premolar by any appreciable space. The other pre- 
molars both above and below differ from those of Pteropus in greater 
development of the cusps and in more trenchant ridges. Small 
posterior molars (m 2 and m 3 ) as in Pteropus. Anterior molars (m 1 
and m 15 m 2 ) resembling the large premolars in their general charac- 
teristics as compared with the corresponding teeth in Pteropus , the 
crown of each with a distinct median longitudinal ridge at middle 
of furrow. This ridge is continuous nearly from end to end of m 2 , 
