422 



NEW AND RARE AUSTRALIAN AGRTONIDiE, 



good point from wliich a subdivision niifjht be made, wlien lie 

 divided tlie genus into two sections, distinguisbed by the form of 

 tlie quadrilateral. In all the Aristi-alian species, together with a 

 few from outside Australia, the quadrilateral is of a very different 

 shape from that of the more typical L^sfex of de Selys' first 

 section. In the text-figures, T have given the forewing- venation 

 of L. viridis(fivst section; fig. 1) and of L. cin(/nIafns{fiecoi\d sec- 

 tion; fig. 2) in the region of the quadrilateral. The hindwing- 

 quadrilateral of L. viridis is almost exactly like tliat of the fore- 

 wing; the hindwing-quadrilateral of L. cinynJatus is shaped as in 

 Fig.3. The differences between the two may be stated as 

 follows : — 



LESTEs(sens.str. ). 



Type: Lestes barbara Fabi-. 



Wim/s rather long for size of 

 insect, and held horizontally in 

 repose. 



Sectors of arcitlvs arising very 

 near its upper end; and hence 



Quadrilateral relatively broad, 

 the width being between one- 

 half and one-third of the long 

 inferior side. Very little differ- 

 ence between (juadrilaterals of 

 fore and hindwings. 



Mediate and subnodal sectors 

 arising nearer to arculus than 

 nodus, and close together. 



AUSTROLEBTES, n.g. 



'J'y pe : Lestes ciu(/idaties8t\ys. 



Wi7i,gs shorter and narrower 

 in comparison with size of insect; 

 completely folded back in repose. 



Sectors of nrcu/us arising 

 nearer its middle, the lower 

 .sector about at the middle; and 

 hence 



Qnadri/ateral much narrower, 

 the width l)eing between one- 

 fourth and one-fifth of the long 

 inferior side. Upper side of 

 quadrilateral distinctly longer 

 in hind wing than in fore.t(See 

 Fig.3). 



Median and snbnodal sectors 

 arising nearer to arculus than 

 nodus, rery close together, some- 

 times from the same point. 



+ III some species of Aualrohstes (as in the tigiired one, A. cintju/atus) Ihe 

 distal side of the quadrilateral is produced xtvdiytit to the margin of the 

 wing; this is not, however, a constant for the genus. 



