362 



Eelatiom" of Watek to the Behavioe of 



By consulting this figure, one can see at a glance that the curves for trans- 

 piration and evaporation correspond. Moreover, the reciprocal of the reaction 

 or behavior curve also corresponds to these curves in a similar manner. Thus 

 in the reaction of the potato beetle, its percentages of positiveness was, broadly 

 speaking, the reciprocal of the transpiration curve. This seems to show that the 

 loss of water from the animal, when exposed in the open, determined the reac- 

 tions of the insect. 



Table 8. — Results of subjecting other insects to the same environmental conditions 

 as Leptinotarsa decemlineata. 



The second experiment was performed to determine the relation of evapora- 

 tion to the transpiration and reactions of insects when exposed for several days 

 under natural conditions. To get a comparison between L. decemlineata and 

 other insects, a cricket {Gryllus), a beetle {Catalpa lanigera), and two species 

 of June-bugs (Lachnosternse) were used, since they could be collected in large 

 r,„rv,Ko.c, T]^ggg insects, with the exception of the potato-beetles, were obtained 



numbers. 



