THE FAMILIES AND GENERA OF BATS. 105 



Genus MACRODERMA Miller. 



1906. Macroderma Miller, Proc. Biol. Soc. Washington, XIX, p. 84, June 4, 

 1906. 



1907. Macroderma Andersen and Wroughton, Ann. Mag. Nat. Hist., 7th 

 series, XIX, p. 137, February, 1907. 



Type-species. — M egaderma gigas Dobson. 



Geographic distribution. — Australia (Queensland). 



Number of forms. — The type species is the only form of Macro- 

 derma yet known. 



Characters. — General form of skull much as in Lyroderma, but 

 postorbital and antorbital processes more prominent, hamular region 

 deeply concave internally as in Megaderma, and interpterygoid space 

 extending forward to level of posterior border of second molar. 

 Teeth more extremely modified than those of Lyroderma. The very 

 small paracone and well-developed metacone separated from outer 

 border of molars by a conspicuous nearly horizontal area. Small 

 upper premolar absent. 



Species examined. — Macroderma gigas Dobson (specimen from 

 from Central Australia, No. 92, 5, 20, 2, Brit. Mus., and photograph 

 of skull of type, kindly furnished by Professor Ehlers) . 



Remarks. — Macroderma represents the extreme phase of the pecul- 

 iar tendency of molar development characteristic of the group. 



Genus LAVIA Gray. 



1838. Lavia Gray, Mag. Zool. and Bot, II, p. 490. 



1846. Liria Agassiz, Nomenelator Zoologicus, Addenda, p. 6. 



1878. Lavia Dobson, Catal. Chiropt. Brit. Mus., p. 155 (subgenus of Mega- 

 derma). 



1905. Lavia Miller, Proc. Biol. Soc. Washington, XVIII, p. 227, December 

 9, 1905 (genus). 



1907. Lavia Andersen and Wroughton, Ann. Mag. Nat. Hist, 7th series, 

 XIX, p. 138, February, 1907. 



Type-species. — Megaderma frons Geoffroy. 



Geographic distribution. — Tropical Africa. 



Number of forms. — The genus is represented by two forms. 



Characters. — Like Megaderma, but lacking the minute upper pre- 

 molar (pm 3 ) frontal region of skull widely expanded and with con- 

 spicuous postorbital processes ; basisphenoid pits obsolete ; upper mo- 

 lars with well-developed mesostyles and normal W pattern; lower 

 molars with outer and inner cusps not unusually close together, 

 those on lingual side well developed, though m 3 is without distinct 

 entoconid. 



Species examined. — Lavia frons (Geoffroy) and Lavia rex (Miller). 



