CHAP, xxvii 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, 

 dark markings ; she 



Fig. 322.— The Piue Saw-fly 

 {Lophyrus pini). 



, Larva ; b, cocoons, the lower one open 

 and empty (natural size). 



and 



her body is yellow, with 

 difiers 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. 



Hylotona rosae is the 

 SaTw-flv^ 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. 323.— The Pine Saw-fly 

 (Lophyrus pini), imago, 

 male. 



Natural size shown by the side. 



