306 



ARTICULATA : ItfSECTA. 



FIG. 390. 



Boring Saw-fly or Horutail, Tremex columba 

 of authors. 



Among the largest of the Hymenoptera are the Boring 

 Saw-flies known as "Horntails," which have the body 



nearly cylindrical, and 

 the blunt abdomen end- 

 ing in a horny point. 

 Beneath this abdomen 

 they have a long saw-like 

 and powerful borer, with 

 which they bore holes 

 into trees, in which they 

 deposit their eggs. Their 

 larvae belong to the great 

 host of tree-borers. 



There are other saw- 

 flies (Fig. 391) belong- 

 ing to the Hymenoptera, 

 which are included in a separate family the Tenthre- 

 dinidse. These Saw-flies are of various species, some of 

 which attack the Rose, others the Vine, others the Elm, 



others the Fir-tree, etc. All 

 have an ovipositor consisting of 

 double saws lodged under the 

 body and covered by two pieces 

 as a sheath. They are sluggish 

 in their habits. Their larvae 

 have from eighteen to twenty- 

 Fir-tree Saw-fly enlarged, Lophyrus tWO legs, and are found ill CO111- 

 abietis, Harris. .,! .-, -, f , . -, 



m unities on the leaves of birch 



and alder, holding fast by their true legs, while the rest 

 of the body is curved upward. 



2. THE SUB-ORDER OF LEPIDOPTERA is composed of in- 

 sects which have four wings covered with scales that are 

 easily removed. The name is derived from the Greek 



FIG. 391. 



