Enallazma. %o\ 



pale lavender with dark grey spots, and ultimately 

 bright blue with blackish-bronze spots. In the female it 

 becomes greyish-green with bronze spots. 



Variation. 



The spots var)' somewhat in shape, and the distinctive 

 one on the second segment of the male is sometimes 

 reduced to a mere transverse streak, quite disconnected 

 from the circlet (Plate XXVII., c) ; onthe other hand, the 

 front margin of the spot is often produced into a short 

 point (Plate XXVII., a). On the Continent these varia- 

 tions (the former especially) sometimes lead to confusion 

 with neighbouring species. In the female the ground- 

 colour is sometimes blue, as in the male, instead of 

 greyish-green. Charpentier figures"^ this as the typical 

 form, but my experience bears out the opinion of 

 De Selyst that it occurs much more rarcl)' than the 

 greenish form. 



Oviposition. 



From the colour and markings it was probably a 

 female of E. cyatliigcriim that the writer was able to 

 observe ovipositing near B}'fleet, in Surre)^ on Jul\' i6, 

 1898. A pair of Agrionines, united per coll, settled on 

 a water-weed, and shortly afterwards the female was 

 noticed descending below the surface, one or two inches 

 at least, and she appeared to be ovipositing. On an 

 attempt being made to catch the male, which was 

 hovering over the spot, she was frightened, and came to 

 the surface. She did not seem to be wetted, but was 



* '■ Libellulina? Europaz'iv," tab. xlii., lig. i. 

 t •' Revu^ des Odonates," p. 208. 



