OF THE SAW-FLIES (TENTHBEDINID,E). 135 



III. The larvae of the saw-flies may be thus classified : — 



A. Larvae with 22 legs (6 pectoral, 4 ventral and 2 



anal). 



a. Feeding upon the leaves of plants. 



1. Solitary ; whilst resting, coiled in a spiral 



manner ; ejecting a fluid from the pores of the 

 body ; forming a regular oval cocoon (Cimbex, 

 Trichiosoma, Clavellaria .) 



2. Solitary or social ; variable in their mode of 



resting ; not ejecting a liquid from the pores 

 of the body. 



* Forming a regular cocoon (Tenthredo, various 



species). 

 ** Not preparing a regular cocoon (Athalia, 

 and other species of Tenthredo, T. Scro- 

 pularice, rafo-cincta, &c.) 



b. Feeding on the leaflets of the pine : social ; not 



ejecting a fluid from the pores of the body ; 

 attached, whilst quiescent, to the edges of the 

 leaflets by the widely spread legs ; forming a 

 cocoon (Lophyrus). 



B. Larvae with 20 legs (6 pectoral, 12 ventral and 2 



anal) ; not ejecting a fluid from the pores of the 

 body, 

 a. Feeding on the leaves of plants ; either solitary or 

 social. 

 1. Resting with the legs stretched out on each side 

 of the edges of the leaves. 



* Forming a regular double cocoon, the outer 



one reticulated and elastic (Hylotoma 

 atrata, ustulata, &c.) 

 ** Forming an irregular double cocoon ; the 

 outer one vitreous and hyaline j the inner 

 one brown (Cladius). 



