BY K. j. TILLYARD. 369 



posterior borders missing. Tlie apices of both teginina are also 

 missing. The left tegmen overlaps the right; but, in process of 

 delamination, its extreme posterior border has broken away, 

 leaving somewhat more of the corresponding border of the right 

 tegmen exposed than would otherwise have been the case. Most 

 of the anal area of the right tegmen is well preserved, but the 

 posterior border is missing, as well as, apparently, the whole of 

 this same area in the left tegmen. 



Judging from the form of the impression, the insect must have 

 been of considerably broader build than is usually found in 

 existing winged forms amongst Australian cockroaches, even if 

 we allow something for flattening down during fossilisation. 



Greatest length of fossil, 1 1 o mm., representing a tegmen whose 

 total length was about 12 mm. Greatest breadth, 5*8 mm., repre- 

 senting a total breadth across the two tegmina in situ of about 

 7 mm., and a probable greatest width for a single tegmen of 

 4 - 5 mm. 



Humeral area narrow, 34 mm. long from base to apex, bounded 

 distally by a simple, nearly straight branch of Sc. Distad from 

 this, Sc gives off another sector, which branches into three. Sc, 

 K and its branches are strongly-formed, moderately thick veins. 

 K sends in all seven primary branches towards the anterior 

 border, excluding the distal forked end of the main stem; of 

 these, the first is a forked vein, the second simple, the third 

 forked, the fourth a long vein with four branches, the fifth also 

 a long vein with three branches, the sixth simple, the seventh 

 short with three branches. (This description applies to the 

 right tegmen only; the distribution of the branches in the left 

 tegmen, as far as these are preserved, is somewhat different). 

 Media a moderately strong vein, branching dichotomously again 

 and again, and sending at least nine branches to the wing border 

 at and below the apex. Cubitus also a moderately strong vein, 

 dichotomously branched, sending six veins to the posterior 

 border. Vena dividens strongly arched, deeply impressed. Anal 

 area just over 5 mm. long from base to apex, greatest breadth 

 about 3 mm. Of the anal veins the first (most anterior) lies 

 close to the vena dividens, and ends up distally upon it; all the 



