464 MESOZOIC INSECTS OP QUEENSLAND, ix., 



R2+3 similarly situated, but the first of tliem much closer to Ei, which is a 

 short vein like that in the genotype, but quite straight. The end branch of 

 R2-1.3 is gently curved, and is joined to an anterior branch of R4+5 by two 

 short cross-veins. R2+3 and R4_|.5 come off far apart, as in the genotype. 

 Branches of M and Cui obliterated; Cu2 apparently a rather stout vein. Length 

 of fragment, 9.5 mm. 



Type, Specimen No. 325a in Coll. Queensland Geol. Survey, Brisbane. 

 Specimen No. 4, figured by me in 1916 {I.e., Plate 1, fig. 5) as doubtfully be- 

 longing to Mesorthopteron locustoides Till., belongs to this species also, but the 

 venation is very poorly preserved. 



Horizon, Upper Triassic, Ipswich, Q. 



Family IPSVICIIDAE. 

 Genus Ipsviciopsis, n.g. (Plate liii., fig. 35; Text-figs. 85, 86.) 



Closely allied to Ipsvicia Till, from the same horizon, but differing from 

 it in having an anterior branch of R present, which I have labelled Ri in the 

 figures, though it may perhaps represent R2_i.3 with Ri suppressed. The tegmen 

 is also of more normal shape, with a less acute apex and much less prominent 

 anal angle of the elavus. Distally R and M are irregularly branched. Cui is 

 curved as in Ipsvicia, but runs much closer to Cu2. The claval Y-vein is pre- 

 sent, but its stem and the distal portion of its posterior arm (2A) are scarcely 

 removed at all from the border of the wing. There are no patches of raised 

 tubercles present, but the tegmen is finely and evenly gTanulated all over. 



Genotype, Ipsviciopsis elegans, n.sp. (Upper Triassic, Ipswich, Q.). 



Ipsviciopsis elegans, n.sp. (Plate liii., fig. 35; Text-fig. 85.) 



Total length, 12.5 mm. ; greatest breadth, 3.8 mm. The specimen is a prac- 

 tically complete left tegmen, obverse impression, which has been turned round 

 in Text-fig. 85, so as to bring the apex to the right. A small piece at the base 

 of the costa has become somewhat detached from the rest of the wing, as may 

 be seen in Plate liii., fig. 35, but has been replaced in Text-fig. 85. There is also 

 some slight abrasion of the angle of the elavus. Rs and M are connected dis- 

 tally by three cross- veins, enclosing between them two elongated polygonal cells; 

 above these is another cell formed by the branching of Rs distally, and closed 

 by another cross- vein. Small branches from Rs and M form a series of irregular 

 and mostly very small cells along the apical margin. M3 + 4 unites with Cui, 

 which is unbranched, thus leaving a large open space below Mi_|_2. The whole 

 tegmen is stained a rich orange-brown. 



The above description applies to Specimen No. 178a, which is the type. 

 Specimen No. 278a is another practically complete tegmen of this same species. 

 It is the obverse of a right tegmen, complete except for an oblique depression in 

 the rock, which runs across the distal portion of the wing, and has caused some 

 abrasion in the depressed portion. The venation is almost exactly the same as 

 in the type, there being only some slight differences in the size and position of 

 the distal cells. 



Types, Holotype, Specimen No. 178a ; paratype. Specimen No. 278fl. 

 Both in Coll. Queensland Geol. Survey, Brisbane. 



Horizon, Upper Triassic, Ipswich. Q. 



