588 Mesozoic inskcts oP Queensland, iv., 



Order Hemiptera, this Suborder representing the original main 

 stem of the Order, while the Heteroptera and Homoptera repre- 

 sent two distinct branches evolved from it. 



Let us now compare Proshole (Text-tig.21) witli the restored 

 wing of Dunsfania, with a view to the establishment of a more 

 complete phylogeny of the Heteroptei-a. 



n 



Text-fig.21. 



Proshoh hirsuta Koken, hemelytron, after Handlirsch; ( x2"l). 



Upper Permian, Kama River, Russia; n, node. 



We notice, at once, that Dunstania is much more definitely 

 Heteropterous, in that it shows the distinction between corium 

 and membrane much more plainly than Proshole does. More- 

 over, the corium of Proshole is strongly pitted, while the mem- 

 brane is smooth. In Dunstania, both are strongly pitted, while, 

 in Dunstaniopsis, the corium is smooth and the membrane 

 pitted. If, then, these genera had a common ancestor, it must 

 have had a wing pitted all over, such as we find still preserved 

 in many Homoptera. In most recent forms, the pits are swollen 

 into tubercles, and no longer carry hairs; but there can be little 

 doubt, from the nature of the pits in Dunstania, that, originally 

 at any rate, they were the bases of insertion of macrotrichia. 

 As we have already seen in the Protomecoptera, the macrotrichia 

 were originally carried upon a dense meshwork of veinlets all 

 over the wing. If, then, the wings of the Protohemiptera were 

 also hairy, we are led to suggest that the true Hemiptera 



