HYMENOPTERA. 



399 



of these insects have a striking resemblance to the caterpillars of 

 Lepidoptera. They can only be distinguished from them by a great 

 globular head, not hollowed out, and by their abdominal legs, in 



Fig. 379. — Larva of a Saw-Fly. {,Tcnthredo). 



Fig. 380.— Lophyrus pini. 



general to the number of more than ten. They 'are called false 

 1 caterpillars (Fig. 379). Most of them, when touched, erect them- 

 selves and move about in a threatening manner. They spin a silken 

 cocoon before changing into pupje. The Lophyrus pini, which 

 devours the leaves of pine trees, belongs to this family. 



