tJie colours of certain Lepidoptera. 



325 



It is evident that these experiments were treated with 

 some neglect, and the food not changed sufficiently often, 

 so that the leaves became brown, and remained so for 

 some time. The results are, however, interesting, 

 showing that such surroundings produce a powerful 

 influence, no less than those provided by dark twigs ; 

 and in the case of Experiment I., it is clear that the 

 effects of the latter were mitigated by those of the 

 former. The results of Experiment II. harmonise with 

 those of other experiments in which darkness jiroduces 

 darkish larvae intermediate between the effects of dark 

 surroundings and of green surroundings in the light. 

 For this would have been the position of the larvte in II. 

 had the experiments upon I. and III. been carried out 

 with care. 



After the experience I have now had with Amphidasis 

 hetularia, I should be glad for the experiments on R. 

 cratcegata to be repeated with the use of other greener 

 food-plants, such as Popidus nigra (if, indeed, the larvae 

 would eat this plant). I anticipate that bright green 

 larvae might be produced in this way without any of the 



