BY E, J. TILLYARD. 463 



Mesocixiodbs obthoclada, n.sp. (Text-fig. 83.) 



Total length, 9 mm. ; greatest breadth, 3.2 mm. This specimen is complete, 

 except for partial obliteration of the distal portion. The costal area is broad, 

 as in the genotype, but Ri is a much longer vein, running straight out from the 

 main stem of R in an obliqne direction to a point about three-fifths of the way 



Text-fig. 82. — Mesocixiodes ierinioneuya, n.g. et sp. Tegmen. (see Plate liii., 



fig. 34.) (x6.7). 

 Text-fig. 83. — Mesocixiodes ori/ioclada,-D.g. at S]!. Tegmen. (x8). 

 Text-fig. 84. — Blesocixiodes brachyclada, n.g. et sp. fragment of tegmen. (x 5). 



along the costa, and thus making the costal area very pointed distally. Foui 

 evenly-spaced branches of R243 are present, and this vein leaves the main stem 

 of R very close to R4+5. M does not appear to be connected with Cui basally, 

 and its distal branches are very indistinct, though the median cell appears to be 

 an elongated cell enclosed between only two main branches. The distal forking 

 of Cui is much longer than in the genotype. Clavus complete, with lA running 

 below and close to Cu2 and very slightly waved; 2A a small loop across the 

 anal angle. 



Type, Specimen No. 318a, in Coll. Queensland Geol. Survey, Brisbane. 



Horizon, Upper Triassic, Ipswich, Q. 



In the absence of any definite evidence as to the tine fonn of the median 

 cell, it seems best to keep this species in the genus Ilesoeixiodies , with which it 

 agrees in its other characters. The species is easily distinguished by the striking 

 form of Ri, which has suggested the specific name ortJioclada. 



Mesocixiodes bkachyclada, n.sp. (Text-fig. 84.) 



This species is represented only by the distal half of a left tegmen of about 

 the same size as that of the previous species, having the four distal branches of 



