152 



antennae : it is peculiar to Europe. The Baron 

 De Jean has mentioned one in his Catalogue, under 

 the name of Orientalis, which is most likely a 

 Dry ops of Leach. Mr. MacLeay remarks in the 

 Annulosa Javanica, that Potamophilus leads off to 

 Ochthebius and the Helophoridae. Omitting any 

 observations on the species, I pass to the family of 



(Heterocerus, Bosc.) 

 Heterocerid^:, MacLeay. 



From the family of Parnus, the approach to the 

 Heteroceridae is by Mr, Stephens' family Limniidse ; 

 indeed, it cannot be denied that the Parnidae and 

 Heteroceridae are intimately connected ; till, how- 

 ever, we are better acquainted with some of these 

 minor groups, it is mere idle speculation attempting 

 to connect genera, when we have scarcely any mat- 

 ter before us to support even conjecture. There 

 are seven known British species ; the true Hetero- 

 ceri appear to belong to the northern regions of the 

 Old and New World ; Het. Dubius is an exception ; 

 it is an East Indian species described by Fabricius, 

 and probably is the type of a sub-genus. As we 

 have but slightly alluded to the genera composing 

 the Limniidee, I add the table before proceeding to 

 other groups, 



