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1. Helophorus, Leach. 



Fabricius originally constituted this genus, giving 

 it the name of Elophorus. Dr. Leach very pro- 

 perly changed it to Helophorus ; there are about 

 twelve known species, the major part of them inha- 

 biting Europe. As they are minute insects, they 

 have generally been neglected, few being recorded 

 as inhabiting either Asia or Africa, and none, I 

 believe, as belonging to the New World. 



Hydrochus, Germar. 



A genus peculiarly attached to northern climes. 

 It occurs in the north of Europe and America, and 

 does not extend, I believe, more southward than 

 Spain - y a great proportion of the species of the 

 remaining four genera appear more abundant in 

 the northern than southern states of Europe. 



Species of Helophorus, Leach. 



Sp. 1. Aquaticus. — As two species have been 

 confounded under the same name, the former takes 

 the name of Grandis, the latter that of Aquaticus. 



Sp. 2. JSfubilus. — -The type of my genus Empleu- 



