104 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



entoconid, which is practically absent from m „. 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 bullae 

 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.— Meg aderma carimatce Miller, M. spasma (Lin- 

 naeus) , and M. trifolium Geoffrey. 

 Remarks.— The genus Mey aderma 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. Euclieira Hodgson, Journ. Asi- 

 atic Soc. Bengal, XVI. p. 891 

 (schistacea—lyra) ; not Eucheira 

 Westwood, Trans. Entom. Soc. 

 London, I, 1836, p. 44. 



1872. Ltjrodcnna Peters, Monatsber, 

 k. preuss. Akad. Wissensch., Ber- 

 lin, p. 195 (subgenus of Megu- 

 tlerma). 



1907. Eucheira Andersen and 

 Wroughton, Ann. Mag. Nat. 

 Hist, 7th series, XIX, p. 134, 

 February, 1907 (genus). 



Type-species. — Mey aderma ly ra 

 Geoffroy. 



Geoyraphic distribution. — Penin- 

 fig. 20.— megaderma spasma. tanjong sula of India, Ceylon, and southern 



Sika Kap, Johoke. No. 112733. xli. Phiim 



Number of forms. — Three forms are recognized by Andersen and 

 Wroughton. 



Characters. — Similar to Meyaderma, 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 Meyaderma, the 

 principal triangle in the upper molars more reduced relatively to area 

 of crown, the posterior border of crown more emarginate. 



Specie* examined. — I have seen all the recognized forms of this 

 genus. 



