746 



STUDIES IN" AUSTRALIAN NEUROPTERA^ 1. 



Some additional Notes on the Venation of MvRMELEONiDiE. 

 We shall conclude this paper with a few remarks on certain 

 structures of systematic importance in the venation, which have 

 not come definitely within the range of study covered by the 

 pupal tracheation. 



(a) The Banksian Line. (Text-fig. 9). 



Rs 



^^TT^R^ 



Text-fig.9. — Phylogenies of the Banksian Line (Series A) and the Gradate 

 Series (Series B) compared. In A, the radial sector is shown with 

 seven branches, numbered from above downwards, or from the apex 

 inwards; Stage 1, archaic unspecialised arrangement [Nymphes, 

 Myrmeleon, etc.); Stage 2, intermediate stage; Stage 3, Banksian 

 line (bl) completed; note that the proximal half of branch 6 is now 

 practically continued by the distal half of branch 7, and so on. In 

 B, the radial sector is shown with nine branches, numbered as 

 before; Stage 1, archaic unspecialised arrangement [Osmylidce); 

 Stage 2, intermediate stage, with two series of gradate veins fore- 

 shadowed; Stage 3, the Gradate Series completed {Chrysopidce), 

 and the other erosa veins suppressed; gs^ proximal, and gSo distal 

 Gradate Series. Diagrammatic. (Original). 



In some genera (e.g., Acmithaclisis, Gle7ioleon), the branches of 



the radial sector are bent in a peculiar manner, so that, with the 



aid of a series of reduced crossveins between them, an apparently 



continuous, or nearly continuous, straight line is formed, running 



through the middle of the apical third of the wing. This line ig 



