872 MESOZOIC INSECTS OP QUEENSLAND, vii., 



which has been restored on typical Seytinopterid lines in Text- 

 fig. 5. . 



Peculiarities in the venation which are probably only of 

 specific value are the following: — the slight double-curving of 

 Sc; the presence of a cross-vein connecting R 4 with the extreme 

 tip of R 2+ 3 above it; and the irregular course of M 3+4 from its 

 origin to the point at which it forks, with the consequent 

 obliquity of the cross-veins connecting both it and M 4 with 

 Cu la . 



Tegmen evidently of a tough, leathery nature, finely pitted all 

 over; the costal margin strongly formed basally. 



Type, Specimen No. 112a. (Coll. Queensland Geol. Survey). 



Horizon: Upper Triassic, Ipswich, Q . 



A comparison of this fossil with Scytinoptera kokeni Handl. 

 reveals a close similarity in the apical portions; but the four 

 closed cells present in M. australis, n.sp. are only represented 

 by a single closed cell, between M and Cu, in S. kokeni. 



Mesoscytina affinis, n.sp. (Text-fig. 6). 



Total length of fragment, 6 mm., representing a tegmen of 

 total length about 9 mm. Greatest breadth, 3.3 mm. 



Tegmen evidently of a tough, leathery nature, strongly pitted 

 all over; all the veins very strongly marked. 



Peculiarities in the venation which are probably only of 

 specific value are the following: — the straight, short course of 

 Sc, and its strongly marked nature; the peculiar curvature of 

 the vein Cu near the base; and the excessive shortness of 2 A 

 on the clavus. The dotted lines in Text -fig. 6 indicate definite 

 creases which are probably cracks due to pressure on this tough 

 tegmen during f ossilisation . 



The specimen is very incomplete, being broken off along a 

 very irregular line, as shown in Text-fig. 6. Most of the clavus 

 is preserved, and the vein 1A shows a very definite waviness, 2A 

 being almost straight. The vena dividens, Cu 2 , is not very 

 strongly impressed, and there is no difference between the form 

 and size of the pits upon the clavus and the rest of the tegmen. 



Type, Specimen No. 235. (Coll. Queensland Geol. Survey) 



Horizon: Upper Triassic, Ipswich, Q . 



The preservation of the clavus in this fossil is of great value, 

 since it enables us to determine at once what was the form and 

 venation of this area in the more typical Scytinopteridae. 



