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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 s ) ; 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 nbseleaf 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, mama 



Brit. Mus., p. 24 (genus). 

 1871. Asellia Peters, Monatsber, k. 



preuss. Akad. Wissench. Berlin 



(subgenus of Pliyllorhina=Hip- 



pisideros ) . 

 1878. Phyllorhina Dobson, Catal. 



Chiropt. Brit. Mus., p. 127 



(part). 



Type-species. — Rhinolophus tri- 

 dens Geoffroy. 



Geographic distribution. — North- 

 eastern Africa and adjoining por- 

 tions of Asia. 



Number of forms.— -Two forms of this group are currently recog- 

 nized, Asellia tridens and A. mvrraiana. 



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 s ) 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- 

 bra?, 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 larvatus. Adult female. 

 Lower Siam. No. 83570. x 2. 



