38o NATURAL HISTORY OF AQUATIC INSECTS CH. 



plebius and a species of Molanna arc additional 

 instances.^ 



Not even the waters of the sea can exchide Hy- 

 menopterous parasites. M. Moniez- has discovered 

 a minute Proctotrupid under stones on the sea-shore 

 at Aigues-Mortes in company with marine Crustacea. 

 The habits of this Insect have not been investigated. 



Aepophilus, so called, because it is often found in 

 company with Aepus, is a small Bug, only three 

 millimetres in length, which inhabits fissures of rock 

 not far from low water. The adult Insect is found 

 onl}' in the month of October. 



A number of marine Thysanura have been dis- 

 covered. There are also False-scorpions, Acari, and 

 at least two Centipedes which inhabit the shore. It 

 is much to be desired that the mode of life of this 

 varied and interesting assemblage of marine animals 

 should be more closely inquired into.^ 



The Insects of the beach hardly ever swim. On a 

 wave-beaten shore the mere attempt to swim would 

 be extremely risky. But far out at sea Insects may 

 safely trust themselves to the surface of the waves. 

 Their action is not however to be called swimming- 

 They run on the surface of the water, like a Velia or 

 a Hydrometra. 



The Insects in question are Halobates and Halo- 



i " Challenger'' Reports, "Zool.," Vol. VII. * 



- Rev. Biol, du Nord, 1 894. 



•^ Professor G. S. Brady and I are endeavouring to collect 

 information concerning the Insects of the sea-shore, and would 

 value the assistance of naturalists who have opportunities of 

 observation. 



