BY R. J TILLYARD. 



263 



of considerable interest, since the insect-fauna already known 

 from the Upper Permian of Newcastle, New South Wales, con- 

 tains only types which would be regarded as of Mesozoic age if 

 they had been found in the Northern Hemisphere. It is also 

 interesting to note that the Upper Jurassic members of the 

 family approach, in their venational type, the Acridiiihe of the 

 present day, whereas the Liassic species differ more widely from 

 these last, in that the number of branches of the radial sector, 

 and the number of cross veins, is considerably less, and the species 

 are of a smaller size In these characters, the new genus is the 

 most reduced of all; so that the supposition now naturally arises 

 that the modern Acridioid type of venation may have been 

 formed by addition of new elements to what was originally a 

 much >-impler and moi'e open type of venation. 



Text-fig. 1. 

 Elcanopsis s?/fZ??e /ensjX n.g. et sp., portion of forewing; ( x 18*5). Upper 

 Permian Coal-Measures : Balmain Colliery, S3'dne5' Harbour. C, 

 costal border; R, radius; Rs, radial sector; Sc, subcosta; the area 

 covered bj- the brown pigment is shaded. 



Elcanopsis sydneiensis, n.sp. (Text-fig. 1). 



Total length of fragment, 7 mm. Greatest breadth, 2*7 mm. 



Foreiving with the distal end of Sc preserved, and apparently 

 ending up on ^) at about the middle of the costal border. R 

 very strongly built, very gently curved, the tip slightly turned 

 upwards. Apparently six very poorly preserved cross-veins 

 between R and C, beyond the end of Sc, and two oblique ones 

 between Sc and R basad from these. Nine or ten cross- veins 

 preserved between Pt and Rs; some of these fairly distinct. Rs 



