Note 90 — Part II. ON THE FINAL CAUSES OF TRANSFORMATION.

Upon this fact obviously depends the statement of that extremely accurate observer Rösel, that the caterpillar of Euphorbiæ is but very slightly variable (“Insektenbelustigungen,” Bd. iii. p. 36). I formerly held the same opinion, till I convinced myself that this species is very constant in some localities, but very variable in others. It appears that local influences make the caterpillar variable.