462 MESOZOIC INSECTS OP QUEENSLAND, ix., 



distally, arising obliquely from R2+3, which is not well preserved. E4+5 is con- 

 siderably branched. M1+2 is a strong, straight vein running to near apex, and 

 ha,ving no branches. M3+4 gives off three anterior branches distally, and also 

 meets two very oblique branches from Cui, the main stem of which is short, 

 and ends up not far beyond the end of the clavus. Cu2 is a straight furrow- 

 vein.' Most of the clavus is preserved, with lA and 2A separate, and sha.fjed 

 much as in the genotyi^e, though 2A is longer. The border of the clavus seems 

 to be somewhat irregular in shape, but is not well presei-ved, and may have 

 undergone some distortion. 



T y p e, Specimen No. 89ft, in Coll. Queensland Geol. Survey, Brisbane. 



Horizon, Upper Triassic, Ipswich, Q. 



Mesodiphthera t)unstani, n.sp. (Text-%. 81.) 



Greatest length of fragment, 10.8 mm. ; greatest breadth, 3.8 mm. The com- 

 plete tegmen was probably about 12 mm. long. 



This species is complete basally, except for a small portion of the border 

 of the clavus ; the apical portion of the tegmen is broken off obliquely, but all 

 the main branching's of the veins are well shown, though a considerable amount 

 of transverse crumpling undergone by the tegmen makes them difficult to follow 

 in places. The species is easily distinguished by the basal bending of M, which 

 arches up so as to touch R, and then bends downwards again until it nearly 

 touches Cu. Also all the distal branchings of R and M tend to turn upwards, 

 and both branches of M are forked. Cut is weakly formed, as in the previous 

 species, but its manner of branching is different. 



Family CIXIIDAE. 



Genus M e so c i x i d e s, n.g. (Plate liii., flg. 34; Text-flgs. 82-84.) 



Allied to Mesocixins Till., and also to Triassocixius Till., but differing from 

 both in having Rl unbranched, while R2+3 sends a series of veinlets to the costa 

 distally. Costal area very broad. Median cell (mc) complete, small, and placed 

 far distally, as in Mesocixius. Cui with a small distal fork. 



Genotype, Mesocixiodes termioneiira, n.sp. (Upper Triassic, Ipswich, 



Q.). 



Mesocixiodes termioneura, n.sp. (Plate liii., fig. 34; Text-fig. 82.) 



Total length, 12.5 mm.; width at end of clavus, 3.5 mm. Th« tegmen is 

 complete except for the absence of the clavus and a slight break near the apex 

 of the wing; it is finely gTanulated all over, and is stained a bright orange- 

 brown. Rl is a short vein, slightly curved, and somewhat similar to the ter- 

 minal branches of Rs+s, though more strongly formed. R2+3 gives off al- 

 together four terminal branches, the first two of which arise close together. 

 R2 + 3 and R4_|.5 are connected distally by a strong cross- vein, and a similar 

 R4+0 branches into two distally, the upper branch having a short terminal fork, 

 cross-vein, r-m, connects R4 + 5 with the closed median cell below it. Mi and 

 M2 are sessile upon the median cell (mc), M3 and M4 shortly stalked from it. 

 A strong cross-vein, m-cu, connects the median cell with the short Cuia below it. 

 There are no cross-veins present in the broad costal area, nor in the spaces be- 

 tween the main veins, except the three distal ones already mentioned, together 

 with im, which closes the median cell. 



T y p e, Specimen 88fl, in Coll. Queensland Geol. Survey, Brisbane. 



Horizon, Upper Triassic, Ipswich, Q. 



