84 PALEONTOLOGY 



elytra (Fig. 45) with a widened costal area : II was 2-branched, 

 M single-branched, while Cu divided basally in Cuj and Ci^. 

 There were three simple anal veins and a general absence of cross 

 veins. In other genera the venation was more specialised by 

 reduction. The hind wings were evidently adapted for folding 

 and, as in Dermaptera, the anterior veins are much modified and 



Fig. 4..5. Protelytron permianum Till. Reconstruction. 

 (From Carpenter.) 



there is a large anal fan formed by a number oF radiating anal 

 veins. The prothorax is large, the tarsi 5-segmented and the 

 antenna? composed of about twenty- two joints. The order is 

 divisible into five families which take their names from the 

 following genera. Protelytron Till., Megelytron Till., Blattelytron 

 Till.. Archehjtron Carp., and Ehjtroneiira Carp. 



Incertae Sedis. In addition to the foregoing there are a number 



