BY R. J. TILLYARD. 749 



three veins became suppressed, the result would be to place the 

 remaining dichotomies of Rs in this recent genus at about the 

 same levels as they are in Mesopanorfa 



Of course, if it is agreed that the specimen represents a hind- 

 wing (and I think that the condition of the forking of M from 

 Cu strongly indicates this), then the Trichoptera are put clean 

 out of court, since their hindwings are developed on quite differ- 

 ent lines, besides being mostly much too weakly chitinised to be 

 preserved in the fossil state. 



The genus Mesopanorpa is evidently not at all closely related 

 to the Permian PennochoristidcH dealt with in the first section of 

 this paper, nor to the recent Australian Choristidce. The genus 

 Mesochorista from the Tpswich Trias is, however, a Mesozoic link 

 between these two families Hence Mesopanorpa, like the 

 Triassic Archipanorpa and the recent Nannochoristidcp, is a re- 

 presentative of quite another line of Mecopterous development. 

 We may confidently expect that, when the Australian Permian 

 and Mesozoic insect-faunas are better known, many new types 

 of development of this ancient and once dominant Order will be 

 brought to light. 



Order COLEOPTERA. 

 'I'he placing of single elytra, however perfect, can seldom be 

 more than a matter of conjecture, since there are scarcely any 

 types of sculpture that are confined to one family only. But, 

 where the fossil specimen is well enough preserved, it is never- 

 theless usual to name it. Thus, a number of what may be termed 

 " genera of convenience " have arisen, of which it may be said 

 that each one serves to gather together, as a single group, all 

 those fossil elytra which show correspondence in shape and 

 sculpture, within certain limits. An example of such a genus 

 is Ademosyne Handlirsch, from the Ipswich beds. Under this 

 name are now comprised no less than ten species, which might 

 belong to the Hydrophilidce, /'arnidce, or Tenehrionidoi, the type 

 of elytron which they represent being commonly found in all 

 three families. 



Most of the elytra in the present collection are not well 

 enough preserved to merit names; but there are five which I 



