4o6 



PECKHAM. 



[Vol. I. 



On August 2 a third specimen of L. nigroveiitris was placed 

 in the cage. Three days' experimenting showed that this spider 

 had stronger preferences than any of the others. The cage was 

 arranged as follows : — 



Blue. 



Figure 3. 

 Red. Yellow. 



Green. 



II 



The record for each color is given just below the line. 



It seemed quite apparent that this animal preferred red, since 

 it returned to this color thirty-three times out of forty-one. 

 St 11 the experiment was open to the objection that it was tem- 

 perature rather than color that determined the spider's move- 

 ments. To test this we carefully covered the eyes of this 

 specimen with paraffine. After having satisfied ourselves that 

 it could not see, we put it back into the same cage. The color 

 now produced no effect. It remained quiet in whatever com- 

 partment it was placed until it was driven out. It was once 

 placed in the blue, with its eyes as close as possible to the red 

 square, but it showed no inclination to enter, although this color 

 had before proved so attractive. When taken out the spider 

 was still blind. The record of this experiment was as fol- 

 lows: Red 6, yellow 6, blue 6, green 5. 



A fourth specimen of L. nigroveiitris $ gave similar results : 

 Red 1 1, yellow 2, blue o, green O. 



The record of a fifth specimen of the same species (a male) 

 was: Red 12, yellow 3, blue O, green i. 



Our last experiment was with a large Lycosa {L. nidicola 9 , 

 Emerton) which we found under a stone on August 18. The 

 arrangement of the colors and the preferences w:ere as fol- 

 lows : — 



