151 



Parnus, Fabricius. 

 Parnidje, MacLeay. 

 Parnidea, Leach. 



This family is composed of but three genera, 

 viz. Parnus, Dryops, and Potamophilus. 



Genera. 



Country. 



Typical Species. 



1. Parnus, Fab. 



2. Dryops, Leach 



j Potamophilus, Germar 

 ■ \ Hydera, Latreille 



England 

 France 



Germany 



P. Prolifecornis, Fab. 

 P. Dumerilii, Lat. 



P. Acuminatus, Fab. 



Parnus, Fab. 



There are six, if not seven, British species in our 

 Metropolitan Cabinets : the genus is common to 

 the Old and New World. Lacordaire informs us 

 of several South American species. It occurs also 

 in the United States, as well as in the West Indian 

 Isles. 



Dryops, Leach. 



This genus will be found characterized in the third 

 volume of Dr. Leach's Miscellany. Dry. Hard- 

 wickii appears the type of another genus. The re- 

 maining genus Potamophilus has eleven joints in the 



