754 



PERMIAN AND TRIASSIC INSECTS FROM N.S.W., 



to the recent genus Plecia, I think that this wing is more pro- 

 perly placed with the Psyllidce; or perhaps it might be put into 

 a new family, which would represent the ancestral form from 

 which both Psyllidce and Aphidce later sprung. The resemblance, 

 both to certain types amongst the Psyllidoi of the present day, 

 and also to the genus Schizoneura amongst the Aphidce, is marked 

 enough to make this possible. 



Triassopsylla plecioides, n.sp. (Text-fig. 16). 

 A portion of a wing 4-6 mm. long, by 2-8 mm. wide, with most 



of the basal half missing, 

 but the whole of the api- 

 cal half preserved. The 

 main veins are very well 

 shown, and appear to con- 

 sist of the upcurved end 

 of Sc, the forked end of 

 Rj, a simple Rs reaching 

 the border at the extreme 

 apex, and a three-branch- 

 ed M whose stem is con- 

 verging basad towards R. 

 Type, Specimen No. 4 

 in Coll. Mitchell. 

 The specific name, ^^/ecioWes, has been given to this type, to 

 indicate the resemblance in its venation to that of the genus 

 Flecia of the family Bibionidce. Unless the basal portion of the 

 wing is preserved, it is quite impossible to separate certain re- 

 duced types of venation in the Diptera from similar types in the 

 Homoptera. No undoubted Diptera have yet been found earlier 

 than the Lias, whereas the Hemiptera go back to the Permian. 

 These facts alone must make one hesitate as to any possible 

 Dipterous affinities for this wing. 



Triassic Insects Incert^ Sedis. 

 1. Coleoptera incertce sedis. (Text-fig. 17). 

 Specimen iVo.9. — A well-preserved fragment of a large elytron, 

 measuring 11 mm. by 4*7 mm., and showing part of the suture, 



Text-fig. 16. 

 Triafd^opf^yUa phci6ide>t, n.g. et sp., wing 

 (length of fragment 4 "6 mm.). Glenlee; 

 Triassic. 



