62 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
sor very small, the inner extremity of the premaxillary projecting 
beside it and appearing at first sight like a second tooth. Lower inci- 
sors as in Pteropus , but disproportion in size between outer and 
inner more evident. Canines not peculiar, except that the lower 
are more strongly curved backward and outward than in the related 
genera. Small upper premolar (pm 2 ) apparently permanent, con- 
siderably larger than in Pteropus. Except for the greater size of 
pm 2 , the two anterior cheek teeth in each jaw are essentially as in 
Pteropus. The three posterior above (pm 4 , m 1 , and m 2 ) and the 
four posterior below pm 4 , m 4 , m 2 , and m 3 ) are remarkable for their 
very flat crowns, with very low, though sharp, peripheral ridges. The 
crown of m 1 and of m 4 is crossed by a distinct transverse ridge be- 
tween the two very rudimentary cusps. General outline of crowns 
as in Pteropus. Skull differing from that of Pteropus in the slightly 
greater deflection of the brain case (alveolar line projected backward 
passes slightly above root of zygoma) and in the low, w T eak posterior 
section of mandible, the coronoid process forming an unusually slight 
angle with the ramus. External characters as in Pteropus , except for 
the presence of a well-developed tail projecting distinctly beyond 
inter femoral membrane. Index finger with claw. 
Species examined. — Boneia bidens Jentink and B. menadensis 
Thomas. 
Genus STYLOCTENIUM Matsehie. 
1878. Pteropus Dobson, Catal. Chiropt. Brit. Mus., p. 15 (part). 
1899. Styloctenium Matschie, Fleclerm. cles Berliner Mus. fur Naturk., p. 33. 
( wallacei .) 
Type-species. — Pteropus wallacei Gray. 
Geographic distribution. — Celebes. 
Number of forms. — One, the type species. 
Characters . — Like Pteropus , but with only 1-1 lower incisors and 
2-2 lower molars; cheek teeth subterete in outline and with smoothly 
rounded crowns. Dental formula : 
- 2 3. 1. - 2 3 4 5 6 - . 2-2 1-1 3-3 2-2 OA 
- 2 1. - 2 3 4 5 6 - 1 1-1’ ° 1-V pm 3-3 ’ m 2-2 — 3 °’ 
Incisors both above and below terete, very straight, the crowns 
abruptly pointed and scarcely differentiated from shafts. Canines 
as in Pteropus , but rather short and thick. Small upper premolar 
(pm 2 ) deciduous, similar in size and form to that of Pteropus. 
Other anterior cheek teeth not peculiar, though rather less pointed 
than in Pteropus. Posterior three teeth in each jaw (pm 4 , m 1 , m 2 , 
and pm 4 , m 13 m 2 ), with crowns nearly circular in outline and with 
eventy rounded surface, the cusps and ridges, though normal in posi- 
tion, so flattened and broadened as to be scarcely noticeable. Skull 
