104 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
entoconid, which is practically absent from m 3 . Skull (fig. 20) 
with rostrum slightly less than half as long as braincase, slender, 
slightly concave above, without supraorbital ridges or special widen- 
ing in interorbital or lachrymal regions, the postorbital processes 
reduced to the merest trace. Basisphenoid pits shallow but distinct, 
partly overhung by the concave-spa tulate hamulars. Audital bullse 
small, their greatest diameter less than width of space between them. 
Sagittal crest low and indistinct, bifurcating anteriorly into two lines 
terminating in the rudimentary postorbital processes. 
Species examined. — M egaderma carimatce Miller, M. spasma (Lin- 
naeus) , and M. trifolium Geoffroy. 
Remarks. — -The genus Megaderma is recognized among its allies by 
the nearly unmodified rostrum and 
lachrymal region, and by the notice- 
ably concave hamular processes. 
Genus LYRODERMA Peters. 
1847. Eucheira Hodgson, Journ. Asi- 
atic Soc. Bengal, XVI, p. 891 
( schistacea—lyraj ; not Eucheira 
Westwood, Trans. Entom. Soc. 
London, I, 1836, p. 44. 
1872. Lyroderma Peters, Monatsber, 
k. preuss. Akad. Wissenscli., Ber- 
lin, p. 195 (subgenus of Mega- 
derma). 
1907. Eucheira Andersen and 
Wroughton, Ann, Mag. Nat. 
Hist., 7tk series, XIX, p. 134, 
February, 1907 (genus). 
T ype-speeies . — Megaderma l y r a 
Geoffroy. 
Geographic distribution. — Penin- 
fig. 20 .— megaderma spasma. tanjong sula of India, Ceylon, and southern 
SlKA KAP, JOHORE. No. 112733. xli. China 
Number of forms. — Three forms are recognized by Andersen and 
Wroughton. 
Characters. — Similar to Megaderma , but skull with noticeably 
widened frontal region, and distinct supraorbital ridges which show 
evident traces of incipient postorbital processes. Base of brain case 
noticeably elongated, the basisphenoid pits obsolete; hamulars small, 
the pterygoid scarcely concave between the process and basisphenoid 
pit. Teeth slightly more aberrant than those of M egaderma, the 
principal triangle in the upper molars more reduced relatively to area 
of crown, the posterior border of crown more emarginate. 
Species examined. — I have seen all the recognized forms of this 
genus. 
