276 



MESOZOIC INSECTS OF QUEENSLAND, VIH., 



gives oil', anteriorly, the long connecting vein m-eu, already mentioned in con- 

 nection with M4, and then divides into Cui„ and Cuit at a point level with the 

 origin of Rs; these two veins ran in a gentle curve to the wing-border, Cui, 

 ending up above the toriius, Cuib more basally on the dorsum. Cu2 lies in a 

 deep groove in the anal furrow, forming the vena dividens, with its apex at the 

 termination of the coriaceous border. 



T«xt-fig. 67. — Mesogereon superbutn , n.sY>- Venation of base of forewing. (x6J). 



The clavus is short and narrow, ending distally at a point about level with 

 the first forking of M. There are only two anal veins, of which lA is nearly 

 straight, and runs very close up to Cu2, except distally, where these two veins 

 diverge, while 2A forms a very flat loop, arising and ending on the posterior 

 border of the clavus. 



The whole of the wing between the radius and the clavus carries the cross- 

 ridges and flat tuberculated areas typical of the family. These are well f''own 

 in Mr. Davies' beautiful photographs reproduced in Plates xvi. — sviii., figs. 18, 

 19, 20. That the tubercles were the swollen sockets of maerotrichia is well seen 

 by a study of the enlargement in Plate xvii., fig. 19, in which the impressions of 

 the hairs can be very clearly seen, especially in the forks between M1-2 and Mjj, 

 and between Ms and M4. 



From just above the apex of the wing right round the termen and dorsum 

 to the distal end of the clavus, there is a well preserved coriaceous border, 

 separated from the rest of the wing by the ambient vein (amb.). This border 

 shows a definite cross-ridging of considerably smaller calibre than that shown 

 along the main veins, as may be seen from a study of Plate xviii., fig. 20. The 

 coriaceous border in the wings of recent Cicadidae shows a similar cross-ridging, 

 but the ridges stand much further apart. The ambient vein {amb.) forms a 

 series of slight bays between the ends of each pair of consecutive main veins, 

 much as in the case of recent Cicadidae, but with the individual bays not so 

 strongly formed. 



Type. Specimen No. 169, in Coll. Queensland Geol. Sui-vey, Brisbane, Q. 



Horizon. Upper Triassic, Ipswich, Q. 



