56 ON PLANTS AND INSECTS. [LECT. 



or eight days, and when the caterpillars are about 

 an inch and a half in length. Now, the difference 

 shows itself still more between the two varieties, some 

 remaining green, while the majority become brown. 

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



FIG. 45. Chcerocampa elpenor. Fifth stage. 



distinct, the diagonal lines plainer, while the white 

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

 eleventh segment. The last stage (Fig. 46) has been 

 already described. 



FIG. 46. CJwerocampa elpenor. Full grown. (Natural size.) 



Now, the principal points to which I desire to draw 

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

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

 (5) the eye-spots. 



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

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

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



