1S87.] VALUE OF COLOUR AND MARKINGS IN INSECTS. 



259 



continued). 



I 



and deepest folds among the green leaves, they were nearly as well 

 concealed. If a leaf hecame rolled up at the edge, there was certain 

 to be a larva inside. The larvae were kept in a glass cylinder 

 upon a plate, and the stem of the food-plant passed through a hole 

 in the plate and into water in a stoneware vessel placed beneath. 

 Sometimes the stem did not fit tightly in the plate, and then all the 

 larvse crept through the hole and rested by day upon the stem 

 above the water, where of course it was very nearly dark. I have 

 had very similar experience with larvae found upon trees. I 

 especially remember one instance in which the leaves were com- 

 pletely removed from the young shoots on one part of a plum-tree 

 trained against the wall. I could not find the larva for several 

 days, but finally detected it most carefully concealed in the folds of 

 the single brown and withered leaf which still remained on that part 

 of the tree. 



I have now given as much information as I possess of the habits by 

 which this larva renders its brown imitative colouring as efficacious as 

 possible for evading the eyes of its enemies. 1 have gone into 

 details in order to show that the larva belongs to a class which is the 



