J 56 INSECTS. 



insects, resembling the Borers and Sawflies, are found in 

 ACULEATA, the second great section of Hymenoptera. 



Subsection I. PHTTOPHAGA. The Phytophaga are 

 divided into the Sawflies, and the Borers, otherwise called 

 Leaf-eaters and Wood-eaters. These are distinguished 

 from each other by the ovipositor, which in the Sawflies 

 is in the form of a pair of fine saws, while in the Wood- 

 borers it is a sort of auger. They are also to be easily 

 Fig. 48. distinguished by the form of the 



lip (labium), which is trifid in 

 the Sawflies, simple in the 

 Wood-borers. The tibia of the 

 fore-leg in the Sawflies has two 

 spurs, in the Wood-borers one. 

 These insects vary also in the 

 form and proportion of the 



Labium of Sawfly Trichiosoma. ,, 



thorax. 



Division I. THE SAWFLIES. The Sawfly, or Ten- 

 thredo* (Pl.VL, fig. 1) is amongst the most easily recog- 

 nised of insects, its form and general appearance readily 

 distinguishing it from all other insects except its allies 

 the Woodborers. From these, as has been said above, it 

 may at once be known by the two spurs on the fore leg, 

 a character the more useful as it does not entail the 

 necessity of dissection, and is available in either sex. 



The body of the Sawfly is of nearly equal width 

 throughout, the head usually, but not always, rather 

 narrower than the thorax. The thorax and abdomen 

 are nearly equal in width, and the sides of the abdomen 



* The name Tenthredo is used because it is familiar as having formerly 

 been that of nearly the whole family. The name is now restricted to on 

 typical genus of the Tenthredinidse. 



