IN CATERPILLARS 157 



mottlings so as to lose much of their force. The 

 green color of all our Rhodocerini and Pierini also, 

 notably of the Little Sulphur (Eurema lisa), wliich 

 feed upon broad-leaved plants and lie exposed 

 upon the surface beside the midrib or prominent 

 vein, conceals them almost completely from view 

 even when the eye is fastened upon them. The 

 long and slender form of Anthocharis with its 

 striking longitudinal stripes would seem to render 

 it a conspicuous object, but if seen upon the lank 

 vegetation upon which it grows beside the long 

 drawn seed pods, it would hardly be noticed. 

 Caterpillars like our Argynnids, which conceal 

 themselves upon the ground, are almost black, and 

 can hardly be distinguished excepting when in 

 motion. Even the color of the huge caterpillar 

 of the Tiger Swallow-tail (Jasoniades glaucus) is 

 such an exact imitation of that of the leaf upon 

 which it rests, whose sides it has so turned up that 

 no profile view may be had of it, that it does not 

 readily catch the eye. 



The few exceptions we have among our butter- 

 fly caterpillars, where striking and conspicuous 

 colors obtain, are perhaps not easily explained. In 

 some, doubtless, the colors may be regarded as 

 warning colors, indicating the unpalatable nature 



