THE FAMILIES AND GENEBA OP 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. Audita! bullae as in Pteropus. Ex- 

 ternal characters as in Pteropus. 



Species examined. — Stylo cienium 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 Geoffboy, Ann. Mus. d'Hist. Nat. Paris, XV, p. 104 (part). 

 1828. Hypoderma Is. Geoffkoy, Diet. Class. d'Hist. Nat., XIV, p. 706 (not of 



Latreille, 1825). 

 1840. Hypodermis Blyth, Cuvier's Animal Kingdom, p. 69. s 

 1878. Cephalotes Dobson, Catal. Chiropt. Brit. Mus., p. 91. 



1898. Dobsonia Palmer, Proc. Biol. Soc. Washington, XII, p. 114, April 30, 



1898. 



1899. Cephalotes Matschie, Plederm. des Berliner Mus. fur Naturk., p. 85. 

 1902. Dobsonia 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- .1-1 1-1 2-2 2 - 2_ oa 



-2 -.1. -234567 b T^T ° l^V pm 3^3* m 3^3 *' 



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 x 

 and m iy 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 , 



