888 MESOZOIC INSECTS OF QUEENSLAND, VU., 



apical margin, and are connected by a single cross-vein, which 

 closes the radial cell (re) distally. Basal portion of M weakly 

 chitinised, and connected with R 4+5 , not far from its origin, by 

 a weak cross-vein. M forks well beyond half-way along the 

 wing, sending finally three distinct branches to the distal margin 

 of the wing. Cross-veins between these and connecting them 

 with Cv^ are so arranged that a set of four irregular cells are 

 formed, two between the branches of M, and therefore repre- 

 senting the true median cell (mc), and two below these, between 

 M and Ciij. Cu x weakly chitinised, its fork normal; a short, 

 weak cross-vein connected Cu L with M just distad from the origin 

 of the latter; Cui h ends up slightly distad from the apex of the 

 clavus. On the clavus, 1A is waved, but approaches the vena 

 dividens distally, and ends up not far from it; 2 A encloses the 

 anal angle. 



Genotype, Triassojassus proavitus, n.sp (Upper Triassic, 

 Ipswich, Q . ) . 



A comparison between this genus and Eurymela (Text-fig. lc) 

 shows the very primitive condition of the radius in the fossil 

 type, Rj being distinct, and R 4+5 remaining a complete longi- 

 tudinal vein, without any fusion with M . This condition is also 

 to be found in the Liassic genus Archijassus Handl. (3, p. 501), 

 which also agrees with Triassojassus in having the median cell 

 divided by a cross-vein. Archijassus, however, has two cross- 

 veins connecting R 2+3 with R 4+5 , and three connecting the latter 

 with M 1+2 ; also, it has four distinct distal branches to M, and, 

 apparently, from Handlirsch's figure (3, Atlas, Plate xliii., fig. 

 41, copied from Geinitz) it had not less than three distinct anal 

 veins upon the clavus, like the Permian genus Permofulgor. 

 Handlirsch figures three other species placed provisionally in 

 Archijassus, but they are not well preserved, and need not be 

 discussed here. 



Triassojassus proavitus, n.sp. (Text-fig. 18). 



Total length, 5.8 mm. Greatest breadth, 2.2 mm. 



The tegmen is beautifully preserved, and complete except for 

 a small piece missing at the anal angle of the clavus, and the 

 mark of the knife or chisel used in delamination of the rock, 

 which has cut into the costal area as shown in Text-fig. 18. The 

 impression is of a dark colour, finely pitted on the clavus, but 

 elsewhere almost smooth. As the vena dividens stands upon a 



