468 MESOZOIC INSECTS OF QUEENSLAND^ ix., 



from base to a little beyond half-way, forming a true vena triplica, characteristic 

 of this family, and joined distally by two strong cross- veins; beyond this point, 

 these three veins continue a short distance, when they are again connected by 

 two cross-veins; at this point, Sc divides into terminal veinlets; Ri and Rs con- 

 tinue a little further, when they are again connected by a cross-vein, after which 

 Rs divides into terminal veinlets; Ri divides into such between the second and 

 third cross-veins. Of the three veins forming the vena triplica, Sc is much the 

 strongest, Ri the weakest. Costal area broad, a little broader than the area 

 covered by Cu and the anal veins, but not so broad as in recent forms; a re- 

 current veinlet present at its base, sending a number of branches to the margin; 

 the succeeding costal veinlets lie close together, mostly arising from Sc at an 

 angle of about 45°, mostly branched, and connected here and there by small 

 cross-veins, which show no tendency to become arranged into a costal series of 

 gradate cross-veins, such as occurs in many recent forms. Apical area missing 

 in the fossil, but its extent can be inferred from the length of the pectinate 

 branches of Rs, some of which are preserved right to the Djargin of the wing; 

 the actual shape of the apex can also be inferred from the comparative width 

 of the costal margin and slant of the costal veinlets. Rs with about fourteen 

 branches descending from the vena triplica, some branched and some simple 

 within the area of the disc, but all branching closely towards the distal margin 

 of the wing. M apparently with five branches within the area of the disc, and 

 connected with the lowest branch of Rs by a strong oblique cross-vein. No 

 fusion of M with Cui distally. Cui strongly formed, remaining unbranched for 

 about three-fifths of its lengih, and then giving oft: numerous branches to the 

 area of the tornus. Cu2 a weakly-formed vein lying closely parallel below Cui, 

 giving off a series of branches from about half-way, and bending strongly down 

 distally below the point where Cui gives off its first branch. lA and 2A slightly 

 arched veins branching longitudinally; 3 A not present as a vein distinct from 

 2A basally. Posterior margin of the wing not strongly arched outwards at 

 base. Cross-veins present in the vena triplica, strongly formed, spaced irregu- 

 larly at fairlj' wide intervals. Numerous weak cross-veins present in the disc, 

 especially in the basal half and between the branches of M almost to the distal 

 margin; there are also weak cross-veins present between most of the outer 

 branches of Rs at about two-thirds of the wing-length from the base; these 

 show a tendency to arrangement as a true gradate series separating the disc 

 from the marginal area; the latter is practically devoid of cross-veins, the cubito- 

 anal area completely so. 



Genotype, Triassopsychops superba, n.sp. (Upper Tiiassic, Ipswich, 



Q.). 



This genus differs from Archepsychops Till, in its less expanded costal area, 

 in having Ri and Rs separate right from the base, and not curved downwards 

 markedly away from Se, and also in having Cui straight at the base, not arching 

 sharply downwards, and making a smaller angle of divergence with Sc than in 

 Archepsychops. This latter genus was placed by me, with Protopsychopsis', in 

 the family Prohemerobiidae ; but it seems probable, on the evidence offered by 

 the new fossil, that it too would possess a true vena triplica of the Psychopsid 

 type, and should therefore be placed within the family Psychopsidae. Proto- 

 psychopsis on the other hand must remain in the Prohemerobiidae, since the 

 form of its apical area shows that a true vena triplica was not present. 



The discovery of this magnificent fossil, complete in all the more important 

 details of venation, enables us to state definitely that true Psychopsidae were 



