137 



Mr. Stephens thinks the Limniidse ought to rank 

 as a family. The British species are ten in num- 

 ber, and seem widely spread throughout Europe. 

 Monsieur Brulle mentions their occurrence also in 

 Asia Minor. 



Dyticus, Fabricws, 

 Dyticid^e, Leach. 

 Dyticoidea, Hope. 



Sp. 1. Latissimus. — The type of the genus Dyticus. 

 Linneus in his Systema Naturae, including under 

 one head the Dyticidse and Hydrophilidse, records 

 only twenty-three species, whereas, at present, in 

 true Dyticus alone, we have nearly the same num- 

 ber. The genus, according to the Baron De Jean's 

 Catalogue, appears to be confined to the northern 

 regions of the Old and New World ; it occurs 

 however in Africa, and on the confines of Asia, 

 and may be expected to occur in the Himalaya 

 generally. 



Sp. 2. Limhatus. — Now a Cy bister of Curtis. 

 Dr. Leach gave the name of Trogus to these species 

 of Aquatic Beetles, a name which had previously 

 been applied to some of the Hymenoptera. (Vid. 

 Panz. Krit. Rev. 2. 80.) it is therefore abandoned. 

 Dr. Eschscholtz has since applied to it that of Tro- 



