368 



MESOZOIC INSECTS OF QUEENSLAND, VI., 



Genotype, Triassoblatta typica, n.sp. (Upper Triassic, 

 Ipswich, Q.). 



This genus is closely related to Hhipidobl 'attina Hand!., from 

 the English Lias, but may be at once distinguished from it by 

 the greater breadth of the tegmen in comparison with its length, 

 and by the absence of intercalated veins and cross-veins. 



The two species that can be placed with certainty in this genus 

 may be distinguished as follows : — 



'Large tegmen (more than 20 mm. long) with definitely 

 strengthened margin to humeral area. 8c with eight 

 branches to border. Anal area with an irregular arche- 



dictyon T. insignita, n.sp. 



Medium-sized tegmen (about 12 mm. long) with humeral area 

 normal, much narrower than in the above. 8c with only 

 four branches to border. Anal area without any reticula- 

 tion T. typica n.sp. 



Text-fig.31. 



Triassoblatta typica, n.g. et sp. (x74). Lett and right tegmina in situ. 

 Upper Trias of Ipswich, Q. Drawn from Specimen No. ISO*. 



Triassoblatta typica, n.sp. (Text-figs. 30a, 31). 

 This specimen is a mould* of both tegmina in situ, the right 

 one almost complete, the left with portions of the costal and 



* The impression is a very flat one, but the rena dividem lies upon a 

 ridge, thus proving that the fossil is a mould, not a cast. Consequently 

 left and right sides are interchanged, as in the figure. Dr. Shaw writes : 

 — "Almost invariably in Cockroaches the left tegmen overlaps the right." 



