732 PERMIAN AND TRlASSlC INSECTS FROM N.S.W., 



Type, Specimen No.31 in Coll. Mitchell. 



Locality: Belmont Beds at a depth of about 600 feet 

 below the top of the Permian Coal Measures. 



Specimen No. 25 appears to belong to this genus also; but, as 

 it shows clearly only the strong veins of the clavus, I have not 

 considered it worth naming. 



Onki MECOPTERA. 

 Family PEKMOCHORLSTID^, fam.nov. 



Scorpion-flies closely resembling the recent Australian Chorist- 

 idce, especially the genus Tceniochorista, with which they agree 

 in having many of the cross-veins very weakly formed and almost 

 obsolete. Hs four-branched, the bifurcation of R2+3 taking place 

 much further distad than that of R4+5. M sends six branches 

 to the apical margin of the wing. Cu^ a straight vein without 

 any branches. The main stem of M is fused basally with Cu^, 

 and arises from it at a level far basad from that of the origin 

 of Rs. 



Uenus Permochorisia, n.g. (Text-figs. 4-6). 



j\[edium sized insects (forewing about 10 mm. long) with 

 moderately broad, well-rounded wings, Sc well-developed, 

 reaching beyond half-way along the costal margin. ' Pterostigma 

 well-developed, elongated, crossed by some weak cross-veins. 

 Cross-veins moderately numerous, very weakly formed, and not 

 specially arranged in such a way as to cause any bendings of the 

 main veins, or the formation of the typical elongated hexagonal 

 cells of more recent Mecoptera. Towards the apex, the cross- 

 veins are either completely absent, or so weakly formed that 

 they cannot be identified in the fossils. 



Genotype, Permochorisia australica^ n.sp. 



Horizon: Upper Coal-Measures of Newcastle, N.S.W. 



The fossil wings of this genus already known are certainly 

 three, and probably four, in number. Two are in Mr. Mitchell's 

 Collection, and are here described. A third is at present on 

 loan to the Natural History Museum in Paris, and would by now 

 have been returned to me for study, had it not been for the risk 



