1-27 



3. Philhydrus, Solier. 



For the generic characters of the above genus, 

 the reader is referred to M. M. Audouin and Brulle's 

 Hist. Nat. des Insectes, Vol. 2. p. 276. Syst. 

 Eleuth. p. 252. and also to Gyllenhall's Insecta 

 Suecica. 



4. Hydrobius, Leach. 



For an account of the species peculiar to Eng- 

 land, the student may consult with advantage the 

 Illustrations of British Entomology by Mr. 

 Stephens, as well as the writings of Marsh am and 

 Dr. Leach. By Fabricius, Solier, Audouin and 

 Brulle, some exotics are also mentioned. 



5. Tropisternus, Solier. 



The insects belonging to the above genus seem 

 peculiar to the New World. Vid. Solier Annales 

 de la Soc. Ent. de France. 



6. Sternolophus, Solier. 



This form appears, as far as is known at present, 

 to be peculiar to Africa, occurring in Egypt, Nubia, 

 and Senegal. Vid. Annales de la Soc. Entom. de 

 France, t. 3. p. 311. 



