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THE CANADIAN ENTOMOLOGIST. 



THE , DESTRUCTIVE GREEN-PEA LOUSE. 



BY WILLIS G. JOHN.SON, COLLEGE PARK, MD. 



Perhaps never in the history of economic entomology has an unde- 

 scribed species of insect appeared so suddenly and over such a wide area, 

 and in such destructive numbers, as the " destructive green-pea louse," 

 the popular name I have given the insect herein described. It has 

 occurred, during the past season, in Maryland, Delaware, Virginia, North 

 Carolina, Pennsylvania, New Jersey, New York (Long Island), Connecti- 

 cut, Vermont, Maine, Ohio, and Canada (Ottawa). 



Fig. 1,.-- Ncctnrophora destructor, winged form. \ tj'pical representation. (Original.) 



It belongs to the family Aphididas, and the familiar and extensively- 

 used genus Siphonophora. Unfortunately, however, Koch overlooked 

 the fact that Siphonophora, as a generic term, was already appropriated 

 for the Myriapoda before he made use of it in his Aphididte ; it is also 

 used to denote an order of the oceanic Hydrozoa. In accordance with 

 modern practice, therefore, it is fitting that we should drop the name 

 Siphonophora and recognize some other. In his synopsis of the 

 Aphididie of Minnesota, O. W. Oestlund proposes the name Nectarophora 

 to take the place of Siphonophora. I see no reason why it should not 

 stand, and place the species described below under that generic name. 



