REACTIONS OF ARTHROPODS TO LIGHTS 



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Figs. 1 to 4 Paths traced by Calliphora larvae, in dilute solutions of methyl- 

 ene blue, in response to the single monochromatic lights, blue, green, yellow and 

 red respectively. 



Figs. 5 to 8 Paths traced by Calliphora larvae in response to balanced pairs 

 of monochr omatic lights of equal intensity and of the same spectral quality. 

 Pairs ot blue, green, yellow and red lights respectively. 



