COLOR AND THE BEHAVIOR OF ARTHROPODS 



83 



was covered above with a flat black screen which was placed 

 nver it immediately after each animal was introduced. 



The tests consisted in giving each individual ten chances to 

 choose betw'een the color corresponding exactly to the tint by 

 w^hich it had been surrounded for some time (at b and c) and each 

 of the five other colors used for the experiments (at b' and c')- 

 In order to avoid fatigue the different individuals w^ere used in 



TABLE I 

 Reactions of six male crayfishes to colors after having been since December 



10, IN A monochrome ENVIRONMENT 



Grand 

 Total 



23 27 



55 45 



48 52 



54 46 



47 53 



48 52 

 275 275 



