16 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



The posterior face is indented medialh'. The anterior face slopes 

 obliquely forward to the external side, while in Megwptera nodosa 



Fig. 9. —Dorsal view of left tympanic of Meqaptera miocahna, about natural size. 

 Cat. No. 10300, U.S.N.M. ; Lompoc, California. 



the reverse is true; that is, it slopes obliquely from the external to 

 the internal side. In outline the external side resembles that of the 



Fig. 10. — Internal view of left TrMPANic of Meqaptera miocabna, about natural 

 SIZE, Cat. No. 10300, U.S.N.M. ; Lompoc, Caufoenia. 



living species, except that in the latter the posterior corner is more 

 abruptly truncated. 



