148 



tion of ten to one, and from what is already known, 

 we may conclude that their metropolis is in the 

 tropical regions. 



Elophorus, Fabricius. 

 Helophoridje, MacLeay. 

 Helophoridea, Leach. 



Mr. Westwood, in his late work, makes Spercheus 

 the connecting link between the Helophoridse and 

 Hydrophilidse. In its form and structure of the 

 legs it certainly accords with the former ; in habits, 

 however, I regard it as an Hydrophilus, and cer- 

 tainly it is more of an aquatic than any of the genera 

 composing the 



Helophoridse. 



Genera. 



Country. 



Typical Species. 



1. 



Helophorus, Leach 



England 



Silp. Aquatiea, Linneus. 



2. 



Hydrochus, Germar 



France 



Elop. elongatus, Fab. 



3. 



Enicocerus, Stephens 



England 



Eni. Viridiaeneus, Stephens. 



4. 



Ochtbebius, Leach 



England 



El. Pygmseus, Fab. 



5. 



Amphibolus, Water. 



England 



Am. Atricapillus, Water. 



6. 



Hydrsena, Kugellan 



England 



El. minimus, Fab. 



7. 



Empleurus, Hope 



England 



El. Nubilus, Fab. 



