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Notes on Aquatic Hvmenoptera and Rediscovery of Prest- 

 wichea aquatica (lubbock). 



By Fred. Enock, F L.S , F.E.S. 

 {Read May 15th, 1896.) 



It is with no small amount of pleasure that I am able to 

 announce to the Quekett Club my success in at last finding this 

 most peculiar Hymenopteron which has for so many years 

 eluded my search. 



The pond from whence Sir John Lubbock obtained the 

 original specimens thirty-four years ago has long since disap- 

 peared and been filled up. Those that now remain in proximity 

 to the locality are not noted for their sweetness, being anything 

 but desirable or even convenient ponds in which to dabble or 

 occasionally paddle. 



I have Avorked most of them in the neighbourhood of Chisle- 

 hurst, but without success so far as concerns aquatic Hyme- 

 noptera. 



In my journeying by rail from London 1 have always noted 

 the ponds skirting the line, and in fact any pond 1 could see, 

 the position of which could be easily ascertained by counting 

 the fields to the next station. One of these struck me as being 

 a very " likely " one, to which in due time I found my way, the 

 long grass and shelter of a hedge protecting me from the vulgar 

 gaze of the owner, of whom I had been warned, but whose 

 acquaintance I had not yet made. The pond is a particularly 

 good one, and from which I hope to obtain some useful infor- 

 mation. Another large wayside horse pond attracted my atten- 

 tion, and was duly visited in the early spring time, when the 

 winding lanes were in their beauty, causing the eye to linger 

 over the flowers and one's footsteps to move slowly, but the pond 

 was not forgotten, and soon I commenced "dipping" and 

 examining the contents of each net or phial. After a few hours' 

 work I noticed a minute insect in the net endeavouring to 



