THE CANADIAN ENTOMOLOGIST 



369 



the figures in the horizontal scale were at the bottom. No im- 

 portance should be attached to the amounts shown on this chart. 

 They were taken from Prof. P. J. Parrott's paper in the Jour. 

 Econ. Ent., Vol. 7, p. 57, simply for the purpose of illustration 

 and should hot be used without reference to Prof. Parrott's article, 



1830 



1900 



1910 



Fig. 33. — Additions to insects of New Jersey during 20 years (showing growth). 



Figure 33 shows the growth, by means of comparative curves, 

 in the knowledge of New Jersey's insects from 1890 to 1910 in ten 

 year periods, this information having been obtained from Smith's 

 Insects of New Jersey. The Coleoptera and Hymenoptera have 

 run along somewhat parallel with respect to the number of add- 

 tional species discovered during the twenty years from 1890 to 

 1910, and the largest part of this growth took place from 1890 to 

 1900. The Lepidoptera and Diptera show "a steady upward 

 trend, and the Heteroptera also, but at a slower rate. In charts 



