BY R. J. TILLYARD. 575 



new evidence, and an attempt at a complete restoration of the 

 wing. 



Specimen No. 147 is in a very poor state of preservation, and 

 represents practically the same area of the wing as is found in 

 the type. It clearly belongs to a somewhat larger insect than 

 the type; and, as the venation differs from that of the latter in 

 some important respects, it will form the type of a new genus 

 within the family Duiistaniidce. 



Specimen No.l07« is in much better preservation than No. 

 147, but it is not so well preserved as the type. The apical part 

 of the wing is missing, but the whole of what was taken to be 

 the basal part in the type is fairly well preserved. On the other 

 side of this there is preserved a large flattened area, with only 

 traces of disconnected venation. On making a careful drawing 

 of this, and trying to establish its connection with the rest of 

 the wing, on which the venation is well preserved, it became at 

 once apparent that this new fossil represented almost the whole 

 {excluding the base and apex only) of a huge Heteropterous 

 hemelytron, and that the supposed almost complete wings pre- 

 served in the type-specimen and in No. 147 were, in reality, 

 nothing more than the distal membranous half of the hemelytron, 

 which is separated anteriorly from the basal half, or coriwm, by 

 a strongly developed node upon the costa. 



With this new and unexpected light upon the problem that 

 had been exercising me for so long, the mystery of the affinities 

 of DuiisUmia became cleared up in a moment. There cannot 

 now be any doubt that these fossils are Heteropterous; the only 

 question that remains for discussion is as to what, if any, recent 

 or fossil families of Heteroptera show any affinity with them. 



Before the fossils, including the type, can be correctly de- 

 scribed in terms suitable to their new position, it will be neces- 

 sary to examine them very carefully, with a view to trying to 

 establish the homologies of their unique venation upon the 

 Comstock-Needham system. This is a difficult task. I propose, 

 therefore, to use the new names under which I shall describe the 

 two new fossils at the end of this paper, in order to facilitate 

 the discussion that must take place before those descriptions can 

 be properly given. 



