BY R. J. TILLYARD. 



461 



Family TROPIDUCHIDAE. 

 Genus Me SOD I PHTH ERA Till. (Text-fig-s. 80, 81.) 

 Tillyard, Proe. Linn. Soc. N.S.W., xliv., pt. 4, 1919 (1920), p. 873. 

 The type of this genus is M. grandis Till., represented by the basal half only 

 of a large tegmen about 20 mm. long. Two more specimens referable to this 

 g?nus are now to hand, and enable us to add to the definition of the genus the 

 following characters: — Branches of R and M irregularly branched distally; a 

 slightly impressed dividing line crossing the wing transversely from near end of 

 Ri to near end of elavus. 



ME.SODIPHTHERA PROSBOLOIDES^ n.Sp. (Toxt-fig. 80.) 



Greatest length of fragment, 14.4 mm; greatest breadth, 5 mm. The complete 

 tegmen was probably about 15 mm. long. 



This species is represented by the gi-eater portion of a fairly large tegmen, 

 evidently of stout build, but not very well preserved. The membrane is creased 

 and cracked in places, making it very diffieult to follow out the details of the 

 venation, in which there are some very unexpected fusions of branch veins. The 



8/ 



Text-fig. 80. — IMesodipMhera prosboloides ,^. sp. Tegmen restored. (x7.5). 

 Text-fig. 81. — Rlesodiphthera dunslani,n. s^. Tegmen restored, (x 11.6). 



structure of the basal half of the tegmen resembles that of M. grandis Till., ex- 

 cept that there is an oblique connecting vein between M and Cui, absent in the 

 genotype, and Cui is weakly foi-med and somewhat irregular. The costal area 

 is broad basally, and shaped as in the genotype. Ri appears as a short free vein 



