178 



INSECT MISCELLANIES. 



Aphis Quercus. a, real size, showing the sucker bent under it like a tail; 

 i, magnified; c, i^ucker magnified. 



With so efficient an instrument for wounding plants, 

 we need not wonder that a race so countlessly nume- 

 rous as the aphides effect most destructive ravages 

 in the vegetable kingdom. The serious ravages 

 of the dolphin, or collier (Aphis Fabce)^ on the bean 

 crop, and of the hop-fly (A. Humuli) in hop- 

 grounds, are but too well known. Of late years an- 

 other of these pests, called the American, or white, 

 blight {Aphis lanigera^ Illiger ; Eriosoma Mali, 

 Leach), has been extensively destructive to our 

 apple-trees. According to Mr. Knapp's information, 



