322 THE CANADIAN ENTOMOLOGIST 



of this species have been reared as primary parasites on either 

 Neoclytus erythrocephalus or Agrilus egenus in locust, by A. D. 

 Hopkins in West Virginia, data recorded under W. Va. Experiment 

 Station Number Hopk. W. Va. 6040a; have been reared from the 

 pupal cells of Liopus alpha in sumach at Tryon, North Carolina, 

 by W. F. Fiske, data recorded under Bureau of Entomology 

 Number Hopk. U. S. 1514c; have been reared as an internal para- 

 site of Lepturgus facetus in chestnut at Tryon, North Carolina, by 

 W. F. Fiske, data recorded under Bureau of Entomology Number 

 Hopk. U. S. 3012a; have been reared as a parasite on Micrasis 

 in hickory at Tryon, North Carolina, by W. F. Fiske, data 

 recorded under Bureau of Entomology Number Hopic. U.S. 3192a 7 . 

 It has also been reared as a parasite of Liopus fascicularis in 

 sumach by Dimmock. 



THE DESTRUCTIVE INSECTS OF NEW JERSEY. 



BY HARRY B. WEISS, NEW BRUNSWICK, N. T- 



Considering the fact that there are 10,385 species of insects 

 listed as occurring in New Jersey, it is surprising how small a 

 proportion of this number is destructive enough to warrant the 

 application of insecticides. The following list, compiled from 

 Smith's "Insects of New Jersey," gives the number of species in 

 each Order which occur in sufficient numbers to be considered 

 destructive and against which measures of control must be directed 

 at various times. It is to be remembered, of course, that there 

 are numerous other species which are classed as injurious, but these 

 do not occur in numbers large enough to make their presence felt, 

 or they confine their attentions to unimportant plants and are 

 therefore not included in the list. 



[Number of species Number of species 



-listed 



Coleoptera . . . 

 Lepidoptera . . 

 Hymenoptera. 



Diptera 



Hemiptera . . 

 Homoptera. . . 

 Qrthoptera . . 



3092 



2120 



1980 



16ril 



504 



479 



154 



-destructive. 



50 



58 



9 



28 



8 



28 



Percentage of, 

 species destructive. 



I.6« 



2.7 

 0.4 

 1,6 

 1.5 



5.8 

 3.2 



Of the entire number of species in New Jersey 10,385, which 

 includes all Orders, only 1.7 per cent, is really destructive. Of 

 the entire number of species in the above seven Orders, 1.8 per 

 cent, is destructive. As to the individual Orders, Homoptera has 



September, 1914 



