274 MESOZOIC INSECTS OP QUEENSLAND, viii., 



mm. long and with a greatest breadth of 15 ram. or more. Portions of all the 

 veins from Sc to Cuib are preserved, but the wing is broken about the middle 

 of the preserved portion of Sf, so that this vein, Ri, Rs, Mi and M2 are all badly 

 bent. Origin of Rs not visible. Forks of M1-2 and Ms -4 are both clearly pre- 

 served, the distance between them being 4 mm. The bent basal piece of M4 lies 

 just within the basal edge of the fragment, and is 0.6 mm. long. These measure- 

 ments are useful for comparison with the wings of the other species. In Fig. 1 

 of my original description of this wing, the vein marked C is Sc , Sc is Ri, R 

 is Rs, the two veins marked M are Mi and M2 respectively, wliile the two marked 

 Cu are M3 and M4. Below these, crossing the posterior angle of the fragment, 

 are a shorter piece of Cui„, and a minute portion of Cuib, the latter labelled 

 A in the fig-ure. 



The cross-ridging of the main veins, and the tuberculated areas lying be- 

 tween them, are fairly well shown, as may be seen from a study of Plate xsi., fig. 

 24, of this paper. 



Type, Specimen No. lf)a, in Coll. Queensland Geol. Survey, Brisbane, Q. 

 Type-counterpart, Specimen No. 196 in same collection. 



Horizon, Upper Triassic, Ipswich, Q. 



Mesogereon superbum, n.sp. 

 (Text-figs. 66, 67, and Plates xvi., svii., xviii.. Figs. 18—20.). 



A remarkably preserved forewing, complete except for a portion of the 

 costal maigin and a small piece missing from the extreme tip. Greatest length, 

 44.5 mm., representing a wing about 46 mm. in total length. Greatest breadth, 

 12 mm., wliich is also the greatest breadth of the complete wing. 



The scheme of the venation is shown in Text-fig. 66. The wing is long and 

 narrow, the costal margin straight from base to half-way, and then very slightly 

 convex. The extreme apex is missing, but appears to have been moderately 

 rounded, or perhaps very slightly pointed. Posteriorly, the wing margin shows 

 a very obtuse angulation about half-way, this angle being the tormis, separating 

 the true dorsum, or basal portion of the posterior margin, from the termen, or 

 I)art lying between apex and tornus. R2-3 runs to apex, and Cuu ends up just 

 above the tornus. Sc and Ri are crowded together close up to the costal margin 

 for their whole lengths, diverging very slightly indeed towards the apex. R and 

 M are fused together for a short basal stretch, after which M separates off as a 

 very weakly indicated vein, sujiported beneath l)y the irregular meshwork of the 

 medio-cubital cell descrilied below. A little beyond the origin of M, Rs separates 

 off from R as a strong vein running just below Ri, and dividing into R2-:i and R4-.-. 

 at a point about one-fourth of the wing-length from the base. R2-3 runs close 

 under Ri for some distance, then diverges very slightly from it in the distal 

 half of the wing, and finally converges towards it again very slightly near the 

 apex, where it ends. This vein remains unbranched throughout. R4-3 diverges 

 slightly from R2-3 at its origin, and then runs sub-parallel to it for about half 

 its length. More distally, it diverges considerably from R2-3, and ends up some 

 distance below the apex. At about two-fifths of the wing-length from the base, 

 R4-5 is connected with Mi by a short but well marked crossvein, r-jii; slightly 

 basad from this there is an appearance of a second, much more weakly formed 

 cross-vein, indicated by the dotted line in Text-fig. 66. 



At about one-fifth of the wing-length from the base, M forks dichotomically 

 jinto two main branches. The upper of these, M1-2, runs to a point just distad 



