BY R. J. TILLYAKD. 



873 



Text-fig. 6. Mesoscytina affinis ', n.g. et sp. (x 13-5). For lettering 



see p. 895. 



Text-fig. 7. Mesodiphthera grandis, n.g. et sp. (x 6-3). For lettering 



see p. 895. 



Genus Mesodiphthera, n.g'. (Text-fig. 7). 



Differs from Mesoscytina, n.g. in having R branching dichot- 

 omously at a level just before the branching of M. (Basal half 

 of tegmen only preserved) . 



Genotype, Mesodiphthera grandis, n.sp. (Upper Triassic, 

 Ipswich, Q . ) . 



Mesodiphthera grandis, n.sp. (Text-fig. 7). 



• Total length of fragment, 12 mm., representing a tegmen of 

 total length over 20 mm. Greatest breadth, 7.5 mm. 



