January, 1915. 



KNOWLEDGE. 



23 



From a photograph iy IT. /. Litcwi. B.A., F.E.S. 



Figure IS. 



Dragon-fiy iAcschna cyancn) with a fly held in its 



jaws. X 3. 



J I^ 



FluTKL JU. 



Mouth-organs of the nymph of Aeschna grandis showing 

 antennae and maxillae. X2. 



Figure 19. 

 Nymph of Aeschna firaiuUs (full-grown). X17. 



Figure 21. 

 The three legs of the nymph of Acsclnia grandis. X 17. ") 



