Principal types of Dragonfly venation. A. Aeschna brevistyla Ramb., (J. B. Hemi- 

 cordulia tau Selys, <, basal portion, c. Caliagrion billinghursti Martin. 

 D. Calopteryx splendens Harris, basal portion. E. Austrolestes cingulatus 

 Burm.. arculus, nodus and long bridge. For references, see pp. 40-43. Original. 



