INSECTS. 199 



but the stalk and principal veins, and passing from leaf to 

 leaf thus strip whole branches of their foliage." 



Fig. 8.3 shows a leaf as it appears with the caterpillars 

 at work. The smaller ones have eaten out only the green 

 portions of the leaf, leaving ah 1 the fine branching veins, 

 while the larger ones have eaten all except the coarso, 



Pig. 83. Larvae of the Procris Americana feeding on the loafc 



