BY R. J. TJLLYARD. 



887 



Text. fig. 17. Mesojassus ipsviciensis, Till, (x 15). For lettering see 



p. 895. 



Text-fig. 18. Triassojassus proavitus, n.g. et sp. (x 15). For letter- 

 ing see p. 895. 



Apart from the fact that there is a considerable portion of the 

 costal area missing, this teg-men is perfect. 



Type, Specimen No. 33. (Coll. Queensland Geol. Survey). 



Genus T r i a s s o j a s s u s, n.g. (Text-fig. 18) . 



Costal margin strongly arched from near the base outwards 

 in the basal third of the tegmen. Sc absent. Cu x departing 

 from R -j- M very close to the base. R and M fused together 

 for more than one-fourth of the wing-length. R divides, a little 

 before half-way along the wing, into R^_3 and R 4+5 . The 

 former gives off R , as a very distinct oblique veinlet to the 

 costal margin, a little beyond half-way along the wing. R 2+3 

 and R44.5 run subparallel to one another and unbranched to the 



