BY R. J. TILLYARD. 371 



third again forked, the fourth with three branches, the fifth with 

 four, and the sixth a many-branched vein sending altogether no 

 less than eight branches to the margin of the wing. M and Cu 

 are forked near their bases. Vena dividens strongly marked. 

 Anal area, as far as preserved, covered with an archedictyon or 

 primitive palteodictyopterous meshwork of weak, irregular vein- 

 lets; the first anal vein lies close to the vena dividens, and pro- 

 bably meets it distally; this vein also forks at about half-way; 

 second and third anal veins, as far as preserved, appear to be 

 simple and moderately wide apart. 



Type, Specimen No. 124. (Coll. Queensland Geological 

 Survey). 



Horizon: Upper Trias, Ipswich, Q. 



In spite of the fragmentary nature of this fossil, there can be 

 little doubt that it belongs to the genus Triassoblatta, since the 

 characters of the costal area, subcosta, and radius agree with the 

 definition, while enough of the anal area is preserved to show 

 that it must have been of considerably greater length, from base 

 to apex, than the completely preserved humeral area. 



TkiassoblattaC?) intkrmkdia, n.sp. (Text-fig. 33). 



This species is represented only by the anal area of a left 

 tegmen, which is almost complete. It may be placed provision- 

 ally in this genus, on account of the forking of some of the anal 

 veins, a character shared in common with the two species already 

 described, but absent from the other genera defined in this 

 paper. 



Total length of anal area, 7 3 mm. Greatest breadth, 3 - 3 mm. 



Most of the vena dividens missing, but the more anterior part 

 of it (vd) preserved. The first anal vein appears to be the 

 weakly formed vein lying just below the vena dividens, and con- 

 nected both with it and with the second anal vein. The latter 

 is a very strong vein, much curved, giving ofi' a posterior branch 

 which does not connect up with any other vein, and anastomos- 

 ing, near its distal end, with the third anal. The third anal is 

 also a strong vein, giving off an anterior branch which, like the 

 very similar posterior branch of the second anal vein, does not 



