46 HYMENOPTERA. 



of this liquor is not well understood, but as 

 soon as it is emitted, the insect wholly with- 

 draws her borer, to repeat the operation in an- 

 other place. Of these holes, she will make from 

 four to twenty by the side of each other. That 

 part of the rose-branch where the deposition 

 has been effected, begins to turn brown on the 

 following day, and the wounds it has received 

 begin to rise and increase in convexity from 

 day to day, till in due time the enclosed egg 

 gives birth to a larva, which bursts its green 

 covering, to seek its food on the surface of the 

 rose-leaf. 



The larvae of the Tenthredines bear a strong 

 resemblance to caterpillars, but have a greater 

 number of feet. They inhabit different trees 

 according to their species ; and some of them 

 exhibit in their economy, peculiarities deserv- 

 ing of notice. The larvae of the Tenthredo pini 

 live in society on the pine-tree. Their company 

 frequently amounts to a hundred ; and when 

 they have consumed all the leaves of the branch 

 they have selected, the whole colony with one 



