124 INDIRECT INJURIES CAUSED BY INSECTS. 



men at my house last summer to such a degree, that, I found it necessary 

 to have them killed. 



Nor are the inhahitants of the waters sheltered hy their peculiar ele- 

 ment from these universal assailants. The larvae of Dytisci, fixing them- 

 selves by their suctorious mandibles to the body of fish, doubtless destroy 

 an infinite number of the young fry of our ponds. Some species of sal- 

 mon (^Salmo fario L.) are the food of an animal which Linne has arranged 

 under Pediculus ; and probably many others of the finny tribes may, like 

 the birds, have their peculiar parasites. Even shell-fish do not escape, 

 for the Nymphon grossipes enters the shell of the muscle and devours its 

 inhabitant. 



I am, &;c. 



