116 



STUDIES IN AUSTRALIAN KEUROPTERA. 



No. 5. The Structure of the Cubitus ix the Wings of the 

 Myrmeleonti d^e. 



By R. J. TiLLYARD, M.A., D.Sc, F.L.S., F.E.S., Linnean 

 Macleay Fellow of the Society in Zoology. 



(With three Text-figures). 



In No.l of this series of Studies,* I worked out the wing- 

 venation of 2Iyrineleon unise7'iatus Gerst., from the pupal wing- 

 tracheation, and showed how, in the forewing, the apparently 

 simple vein M was in reality a forked vein, the vein usually con- 

 sidered to be Cuj being in reality the cuhito-median, Cu^ -1- M.,, and 

 the point of incidence of M2 on to the line of Cuj being marked 

 by the foot of the oblique vein O. The branch descending from 

 the point of bifurcation, which I called the cubital fork (cuf), 

 was, naturally enough, taken to be Cuo. It was on the lack of 

 specialisation of this branch, that I based my argument for the 

 recognition of the tribe Protoplectrini, of which the correct name 

 should be Creagrini, as previously given by Navas. 



In No. 4 of this same series of Studies,! when describing the 

 wing- venation of the Hemerohiidce, I showed how, in the fore- 

 wings of Drejmnepteryx and Drepanacra, an archaic Cug was 

 present close to the base, and that, in addition to this, Cu^ was 

 strongly branched at a sharp angle, much further distad, into 

 two veins which I called Cuj^ and Cuu, In the allied genus 

 Drepanomina, the archaic Cuo is lost, and replaced by a furrow. 

 In the majority of the smaller Hemerobiidce, even the furrow has 

 disappeared. Thus, in the most highly specialised forms of the 

 family Hemerohiidce, all traces of the original C\x.^ are lost, and 



'' These Proceedings, 1915, xl., Pt.4, pp. 734-751, PL Iviii. 

 \0p. cit., 1916, xli., Pt.2, pp.269-332, Pis. xii.-xix. 



