NATURAL CONDITIONS. 73 



DRAGON FLIES. 



I. Natural Conditions under which they Breed, 

 WITH Life History so far as Applicable or 

 Known. 



In the vicinity of New York the perfect insects appear 

 among a few species as early as the latter part of May in 

 a favorable season, increasing in both numbers and variety 

 of species until about the middle of August, and de- 

 creasing rapidly until their disappearance, which may be 

 extended as late as October 1st. 



The following table of time, of appearance, and locality 

 frequented, prepared from data upon specimens collected 

 by myself, will be interesting and valuable in this con- 

 nection, only those species being included which, from my 

 personal knowledge of their habits, would seem at all 

 available for the purpose suggested. No accuracy is 

 claimed for it beyond my personal observation. 



