90 



XXIV. On the distingiiishing Characters of two 

 Families of Coleopterous Insects named Hydro- 

 philii by Latreille, with a Synopsis of the Genera 

 composing them. 



HYDROPllILIL 



FamiUce. 

 Hydrophilii. Latreille. 



Mandibulce ad a pice m inerines. Cor' 



/?w* elongatum - - - 1. Helopiioridea, 



MandihulcE ad apicem bidentatae. 



Corpus ovale aut subrotundum 2. IiYDROPHlLlDEA» 



ram. I. HELOPHORIDEA. 



Synopsis Stirpium et Generum. 



Stirps 1. Clypeus integer. (Palpi maxillares articulo ulti- 

 mo crassiore ovali.) 



Genera. 

 Oczii sessiles. 77ior6f.r transversus 1. Helophorus. 

 Ocul'i valde prominuli. Tliorax elon- 



gatus - - - - 2. HypROCHUS, 



Stirps 2. Clypeus integer. 



Falpi maxillares mediocres articulo 



ultin:io graciliore acuto - - 3. OciITHEBIUS^ 

 Falpi maxillares longissiini articulo 



yltimo utriuque acuininato - 4- IlYDRiENAv 



