HYMENOPTERS: SAW-FLIES. 137 



BORING SAW-FLIES. 

 The Boring Saw-Flies have a long hody, and the 

 hind body is blunt, and ends in a horny point. Ex- 

 tending from beneath the hind body is a long, saw- 



Fig. 262. — Boring Saw-Fly, or Pigeon Tremex. 



like, and powerful borer, which is used to make holes 

 in trees, in which to lay their eggs. In the larva state, 

 they live in the trunks of trees. 



TRUE SAW-FLIES. 



The females of the true Saw-Flies have an ovipositor 

 composed of two saws, enclosed between two horny 

 pieces, which serve as a sheath. These saws are pro- 

 jected and withdrawn when 

 the insect is cutting a place 

 for her eggs ; but not togeth- 

 er, for while one is pushed 

 forward, the other is with- 

 drawn. When the hole is 



cut deep enough, the eggis Fig. 263.'- Fir-tree Saw-Fly, 



deposited within. Saw-Flies enlarged. 



