MEANS OF DEFENCE OF CATERPILLARS. 



187 



and then raising its head to the perpendicular position 

 again, it thus effects one step., and proceeds in the 

 same manner till it reaches the top. 



Other caterpillars, when they are disturbed, employ 

 a different method of breaking their fall without 

 spinning a thread, taking advantage, for this purpose, 

 of the long hairs which cover their body. Those 

 who have seen a hedge-hog (Erinaceus Europceus), 

 when attacked by a dog, roll itself up into a prickly 

 ball, will readily conceive the manoeuvre of the cater- 

 pillars to which we allude, it being precisely similar. 





a, Caterpillar of the tiger-moth (Arctia Caja). 6, the same 

 rolled up for defence, c, grub of the- museum-beetle. <L the 

 same magnified. C) tail of H;e same, magnified. /, $-, its hairs 



