A typical winged female of tliis insect is shown in figure 1 with wings 

 expanded, showing venation at a, and a lateral view of the same with 

 wings folded in their natural position when the insect is at rest or feed- 

 ing is presented at h. At c an apterous or wingless form of the insect 

 is shown, and d illustrates the nymph in its last stage. The structure 

 of the third antennal joint of the winged form may be seen at e highly 

 magnified. 



DISTRIBUTION. 



From the fact that this species had remained unrecognized until 1899, 

 and has not been found elsewhere than in the United States, the con- 

 clusion was reached by some writers that it is indigenous to this country. 



Fig. '[.—Nertarophiii-a desfnictor : a. winged female: b. Mime from side with wings folded in natnral 

 position when feeding: c, apterous female : rf, nymiih in last stage; c, third joint of antenna of 

 winged form— a-d, much enlarged, e, more highly magnified (author's illustration). 



Although this may be true, there are better reasons for believing it to 

 have been introduced from abroad, probably from Europe, one being 

 that injury of the severity noted by a species hitherto unrecognized as 

 distinct from others of its kind is almost without a parallel in the his- 

 tory of economic entomology. It seems probable, therefore, that we 

 have in this pea louse a case analogous to that of the European gypsy 

 moth, which was present in this country for about twenty-five years 

 before it became a pest. 



The first notice of severe attack to pea that can with positiveness be 

 attributed to the destructive green pea louse was reported to this office, 

 in a letter dated May 16, 1899, by Mr. Thomas Bridges, Bridges, Va. 



