ii.] CHANGES OF COLOR 55 



The eye-spots are more marked, and the pupil more 

 distinct, the diagonal lines plainer, while the white 

 line is only indicated on the first three, and on the 



FIG. 42. Chcerocampa elpenor. Fifth stage. 



eleventh segment. The last stage (Fig. 43) has been 

 already described. 



FIG. 43, Chccrocampa elpenor. Full grown. (Natural size.) 



Now, the principal points to which I desire to draw 

 attention are (1) the green color, (2) the longitudinal 

 lines, (3) the diagonal lines, (4) the brown color, and 

 (5) the eye-spots. 



As regards the first three, however, I think I need 

 say no more. The value of the green color to the 

 young larva is obvious ; nor is it much less clear that 

 when the insect is somewhat larger, the longitudinal 

 lines are a great advantage, while subsequently diagonal 

 ones become even more important. 



The next point is the color of the mature cater- 

 pillars. We have seen that some are green, and others 



