112 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
formula, well-developed ears, crowded lower incisors, conspicuous 
nasal inflation, moderate posterior expansion of zygoma, and absence 
of noticeable sagittal crest in interorbital region. Superficially it 
rather closely resembles Rhinolophus , but is distinguishable, aside 
from the more important skeletal characters, by the smaller cochleae 
and the absence of the small lower premolar (pm 3 ) ; the third upper 
molar is usually smaller than in Rhinolophus , and never as compli- 
cated as in some species of the latter. The species differ markedly 
among themselves in the form of the ears and noseleaf as well as in 
other characters, a fact which has given rise to a considerable number 
of generic and subgeneric names. For the present only one of these 
groups, Asellia , is recognized as dis- 
tinct from Hipposideros ; but fur- 
ther study of the species may show 
the convenience of distinguishing 
others. 
Genus ASELLIA Gray. 
1838. Asellia Gray, Mag. Zool. and 
Bot., II, p. 493 (subgenus of 
Hippisideros). 
1843. Asellia Gray, List. spec. mamm. 
Brit. Mus., p. 24 (genus). 
1871. Asellia Peters, Monatsber, k. 
preuss. Akad. Wissench. Berlin 
(subgenus of Phyllorhina= Hip- 
pisideros) . 
1878. Phyllorhina Dobson, Catal. 
Chiropt. Brit. Mus., p. 127 
(part). 
T ype- species. — Rhinolophus tri- 
dens Geoffroy. 
Geograp hie dis tri hu tion . — N or t h - 
eastern Africa and adjoining por- 
tions of Asia. 
Number of forms. — Two forms of this group are currently recog- 
nized, Asellia tridens and A. murraiana. 
Characters. — In general similar to Hipposideros , but skull with 
low braincase and deep rostrum (greatest depth of braincase dis- 
tinctly less than that of rostrum, including molars), the sagittal 
crest greatly developed in interorbital region; distinction between 
the fused phalanges of third, fourth, and fifth toes persistent ; small 
upper premolar (pm % ) absent; upper canine with slightly developed 
secondary cusp above middle of shaft; and third upper molar very 
narrow, with only four cusps and two commissures. Lumbar verte- 
brae, except last two, fused into a solid rod. 
Species examined. — Asellia tridens (Geoffroy). 
Fig. 21. — A, Asellia tridens. Adult fe- 
male. Egypt. No. 38021. x 2. B, Hip- 
posideros LARYATUS. ADULT FEMALE. 
Lower Siam. No. 83570. x 2. 
