By R. J. TIIJA'AKD. 451 



veins in the radial and median areas below them. The number and position of 

 the terminal branches o£ Rs and M may also be considered as specific characters; 

 R3 has four closely placed anterior branchlets, while Mi + 2 and M3+4 both run 

 straight to the wing margin, giviiig off only posterior branches as shown in Text- 

 fig. 73. Mi_|_2 converges towards R5 from below. 



Type, Specimen No. 86a, in Coll. Geol. Survey, Brisbane. 



Horizon, Upper Triassie, Ipswich, Q. 



The size of this wing appears to indicate a small insect, not unlike the 

 present day Perlamantinae, and possibly of somewhat similar habits. The re- 

 storation of the missing parts of the wing, in Text-fig. 73, is made on the sup- 

 position that the missing portion of the venation was on the Perlamantine plan. 



Family LOCUSTOPSIDAE. 



This family was formed by Handlirsch to include a number of Liassic and 

 Upper Jurassic Locustoid insects allied to the Elcanidae, but differing from 

 them in having M branched instead of simple, Sc much longer, and Cu not 

 fused bssally with M. The fossil from the Upper Trias of Ipswich, which I 

 here place under this family, agrees with the Locustopsidae in all characters 

 except only the short Sc, a character which I do not consider of sufficient im- 

 portance to justify the making of a new family to contain it. The definition 

 of the family Locustopsidae will therefore need emending as regards the length 

 of Sc, which may be either short or long. These insects appear to have been 

 slender, voiceless Locustoids, having very long and slender antennae, and with 

 the long, slender hind-legs not armed with spines. 



Genus Triassolocusta, n.g. (Plate li., fig. 28; Text-fig. 74.) 



Insects of moderate size, with forewing very long and narrow. Sc ending 

 up before half-way along costal margin, and provided with a shorter anterior 

 branch. Rs arising somewhat before half-way along the wing, with four distinct 

 and well-spaced branches arranged in pectinate series. M branching into three 

 near level of origin of Rs; the most posterior of these three branches, M3+4, forka 

 again distally. First fork of Cu placed well away from base, at about one- 

 fourth of the wing-length. Cui arching somewhat flatly upwards, connected with 

 M above by an oblique vein (Ms), and forked distaUy. Cua short, straight, 

 ending up very close to Cuii. (Clavus missing). 



Genotype, Triassoloctista leptoptera, n.sp. (Upper Triassie, Ipswich). 



Triassolocusta leptoptera, n.sp. (Plate li., fig. 28; Text-fig. 74.) 



Total length, 21 mm., greatest breadth (at about one-fifth from apex), 4 

 mm. The specimen is a very clear impression of a right forewing, complete 

 except for the loss of the very narrow clavus and slight damage to the basal 

 portion of the costal margin. Veinlets and cross-veins are only faintly pre- 

 served, and are mostly omitted from Text-fig. 74. Sc gives off an anterior branch 

 Sci, quite close to the base; this branch has about four faint oblique cross-veins 

 below it, and is separated from the end of the main stem of Sc by two oblique 

 veinlets. From a little before the level of the end of Sc, R begins to give off 

 anterior veinlets running very obliquely to the costal margin. There are three 

 of these, the last being at the level of the origin of Rs. Next comes a fairly 

 long anterior branch, running at a very slight angle to Ri itself, and eai-rying 

 on it four or five shorter anterior veinlets. Beyond this branch lies a series of 

 pterostigmatic veinlets, eight in numlier, less obliquely placed. Ri itself ends 



