INDIRECT INJURIES CAUSED BY INSECTS. 167 



the American rabbit and hare are infested by the 

 largest species of ffistrus^ yet discovered ; and our do- 

 mestic rabbits sometimes swarm with the bed-bug. This 

 was the case with some kept by two young gentlemen 

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

 it necessary to have them killed. 



Nor are the inhabitants of the waters sheltered by their 

 peculiar element from these universal assailants. The 

 larvsB of Dytisci fixing themselves by their suctorious 

 mandibles to the body o^Jish, doubtless destroy an in- 

 finite number of the young fry of our ponds. Some 

 species of salmon (Sabno 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 shellfish 

 do not escape, for the Ni/mphon grossipes, Latr. enters 

 the shell of the muscle and devours its inhabitant. 



I am, &c. 



* Considered by Mr. Clark as a new genus, which he has named Cw 

 terebra, and of which he has described three species. Essajf on ike Bots of 

 Morses, S^-c. p. 63. i. 2. f. 24-29. 



