884 MESOZOIC INSECTS OP QUEENSLAND, Vli., 



Type, Specimens 204a (cast) and 2046 (mould), glued side 

 by side in a single box. (Coll. Queensland Geological Survey). 

 Horizon: Upper Triassic, Ipswich, Q . 



Family JASSIDAE. 



Se usually absent; if present, weakly formed, and not looped 

 up with R as in Cercopidae. R, M and usually Cu x fused to- 

 gether into a single stalk basally for an appreciable distance. 

 Clavus triangular, the anal angle obtuse; separated from the rest 

 of the tegmen by a straight vena dividens ( Ci3 2 ') . No claval Y- 

 vein; the claval veins 1A and 2A both usually present, placed 

 far apart. 1A usually waved, 2 A enclosing the anal angle. 



Key to the Upper Triassic Genera. 



( Cuib ending up exactly at apex of clavus ; apical third of tegmen 



J with many closed cells. Eurymelidium , n.g. 



(1) | Cuib ending up somewhat beyond apex of clavus ; apical third of 

 L tegmen with few closed cells. 2. 



(2) -\ 



' E without apparent longitudinal branches ; the median cell (mc) 

 normal, without any supporting cells beneath it. 



JlZesojassus Till. 



R with definite longitudinal branches ; the median cell (mc) ab- 

 normal, divided by a cross -vein, and with small supporting cells 

 between it and the cubitus. Triassojassus, n.g. 



Genus Eurymelidium, n.g. (Text-fig. 16). 



Sc absent. R, M and Cuj fused together for a considerable 

 distance from base. Distance between origin of Cuj from com- 

 mon stem and point of separation of R from M less than length 

 of common stem of all three veins. After leaving M, R arches 

 up considerably towards costa, then bends away again, dividing 

 into R2+3 and R4+5, the latter fusing almost at once with M 1+2 . 

 Between R 2 , 3 and costal margin is a series of transverse veinlets, 

 of which the first may represent the shortened R v Courses of 

 R 2+3 and R 4+5 somewhat irregular, the space between them 

 divided by three cross-veins into cells. After leaving R, M 

 bends downwards; about the middle of the wing, it divides into 

 M 1+2 and M 3+4) the former arching up to unite with R 4+5 , the 

 latter continuing straight on ; the space between the two branches 

 of M is divided up by four cross-veins into cells. Two cross- 

 veins connect M with Cu, one being not far from the origin of M 



