578 MESOZOIC INSECTS OF QUEENSLAND, iv., 



to the precedent traeheation, these veins are shown to be the 

 subcosta, radius, media, and cubitus respectively. As in most 

 Heteroptera, the subcostal trachea lies close up to the costal 

 border; in the imago, the subcostal vein becomes more or less 

 fused with this border. The radius and media are fused for 

 some distance from their bases, and then diverge gradually at an 

 acute angle. The cubitus is a separate vein, lying about half- 

 way between the media and analis. 



Having made the above comparison with Syromastes, it now 

 becomes an easy task to name the radius, media, and cubitus in 

 the corium of Dunstaniopsis. This is shown in Text-fig. 18. 

 Owing, however, to the bad state of preservation, in this fossil, 

 of the dividing line between corium and membrane, we cannot 

 proceed to name the numerous veins in the latter area with any 

 certainty. Here, however, we may fall back upon the type- 

 specimen of Du7istania, in which there is just enough of the 

 corium preserved to enable us to make the necessary connections. 



In my original description of Dunstania, I paid little atten- 

 tion to this part of the wing, believing it to represent only a 

 small flattened-out portion of the thorax of the insect. I now 

 give, in Text-fig. 19, a careful drawing of the region of the node 

 and dividing line in this fossil. From the figure of Dunstani- 

 opsis, it will be seen that Pv and M, after diverging from one 

 another in the middle of the corium, again begin to converge, 

 and are then unfortunately lost in a break in the rock-surface. 

 In Dunstania, however, we are able to pick up these two veins 

 as they approach the dividing line. R is seen to be just dividing 

 into Rj and Rs, while M converges towards the latter as a stout 

 vein from below. Sc is fused with the costa, as in Dunstaniopsis. 

 Between Sc and R there are a number of oblique ribs, half fused 

 into the corium; these can also be seen in Dunstaniopsis, further 

 basad along the same area. 



Just before the level of the node, Rs turns upwards, and 

 partially fuses with R^. From the combined stem thus formed, 

 three branches pass out into the membrane, viz., Rj, R.^, and R3.5. 

 Of these, Rj is a short vein lying close alongside the costal 

 jnargin, and supporting it from below; it ends up at about one- 



