AMONG CATERPILLARS 43 



(Euvanessa antiopa), the Anieriean Tortoise-shell 

 (Aglais milberti), the Compton Tortoise (Eugonia 

 j. -album), and the Melitaeini in their earlier stages, 

 we have, even in our own fauna, instances of naked 

 caterpillars which enjoy the same means of protec- 

 tion, such as the Tawny Emperor (Chlorippe cly- 

 ton) and the Blue Swallow-tail (Laertias phile- 

 nor), especially in their earlier stages. 



The greatest danger to caterpillars would seem 

 to be when they are in motion, as they are then 

 more readily detected by insectivorous creatures. 

 To guard against such danger, many caterpillars, 

 as all the Satyrinae, are excessively slow in their 

 movements. Most caterpillars remain absolutely 

 still during all times when they are not actually 

 eating or on their way to their feeding spots, but 

 some have the habit, in passing to and from their 

 feeding grounds, of moving with the utmost rapid- 

 ity, hurrying as if their safety depended upon it, 

 as doubtless it does. Such are all the Argynnini, 

 and I have noticed a similar habit in the Gray 

 Comma (Polygonia progne). Others, again, 

 among the slow movers have a very peculiar trick, 

 which I do not remember to have seen mentioned 

 by others ; it is a sort of rocking motion, not from 

 side to side but forward and backward, moving 



