IV] 



THE LARVA OR NYMPH 



83 



(vi) Lestinae (fig. 32 H, j). A most remarkable and highly 

 differentiated type. Mentum and sub-men turn of variable length ; 



N. 



Fig. 32. Variations in the form of the mask, chiefly in the lateral lobes. A. Aeschna 

 brevistyla Ramb. B. Gynacantha rosenberghi Selys. c. Austropetalia patricia 

 Tillyard. D. Hemigomphus heteroclitus Selys. E. Diphlebia lestoidex Selys. 

 F. Caliagrion bittinghursti Martin. 6. Synlestes weyersi Selys (with cleft 

 median lobe also shewn). H. Austrolestes analis Ramb. J. Austrolestes 

 psyche Selys (distal border). K. Petalura gigantea Leach (with prominent 

 median lobe also shewn). L. Cordulegaster annulatus Latr. M. Azuma 

 elegans Br. K. Diplacodes haematodes Burm. (with half of 'mentum also 

 shewn), o. Hemicordulia tau Selys (distal border), p. Austrocordulia refracta 

 Tillyard. Q. Cordulephya pygmaea Selys. R. Calopteryx splendens Harris 

 (deeply cleft median lobe). Original. 



62 



