CHAP, xxvn INSECTA : HYMENOPTERA 



431 



in one of the curiously contorted attitudes characteristic of 



it. When full grown, the larva spins a little, oval, brown 



cocoon, inside of which it 



remains dormant for a couple 



of weeks only, if it belongs 



to the first brood in the 



year ; or for the whole winter, 



if it is of the second brood. 



It changes to a pupa only 



a short time before the fly 



emerges. 



The winter - cocoons are 



usually formed in the ground, 



and are larger than the spring 



ones. The perfect winged 



insect is not often noticed as 



it is quiet and inconspicuous, 



and the body is only about ^ 



of an inch long. Fig. 323 



represents a male Pine Saw- 

 fly with his characteristic 



dark-coloured body and beau- 

 tiful branched antennae. The 



female is more than one-third 



as large again as the male, and her body is yellow, with 



dark markings ; she differs also from the male in her 

 small, jointed, downy antennae. The 

 eggs are laid early in the year on 

 the pine leaves, and the larvae from 

 this first brood form their cocoons in 

 July. 



Hylotoma rosae is the 

 saw-fly which does so much 

 damage to rose-trees, for 

 its small green larvae (always mis- 

 taken for Lepidopteran caterpillars 

 by the uninitiated) destroy the leaf 



very rapidly. They can be easily distinguished from true 



caterpillars by their legs, and also by the characteristic way in 



which they curl up when touched. The action of the saws as 



the female lays her eggs is especially easily seen in this species. 



FIG. 322. The Pine Saw-fly 

 (Lophyrus pini). 



a, Larva ; b, cocoons, the lower one open 

 and empty (natural size). 



FKJ. 323.- The Pine Saw-fly 

 (Lophyrus pini), imago, 

 male. 



Natural size shown by the side. 



