THE INSECT WORLD. 



One curious feature is that nearly all these span-worms closely 

 resemble little dried twigs, branches, or even the stems of the 

 leaves upon which they feed. Many of them when at rest hold 

 to the twig by the hind feet only and keep the body rigidly ex- 

 tended, seeming for all the world like a small process from the 



Fig. 353. 



The lime-tree moth, Hybernia tiliaria. — Larva all sizes ; winged male and wingless 



female. 



plant itself I well remember one occasion when Cymatophora 

 pampinaria was excessively abundant on certain cranberry bogs 

 on Cape Cod. I saw the spaces that had been defoliated and saw 

 the edge of the spaces unaffected, but, look as I would, I could 

 not at first see the caterpillars. It was not until a little smoke 

 was started over the edge of the attacked portion that larvae were 

 observed, and then it seemed as if all the little twigs and branches 

 obtained life in an instant and started travelling. The insects so 



