TENTHREDO. 45 



{). With setaceous antennae, composed of 

 several articulations. 



The instrument which the female Tenthredo 

 uses to deposit her eggs, is contained between 

 two scaly laminae, or grooves, at the end of the 

 abdomen. She can exert it at pleasure ; and, 

 being serrated, it serves her as a gimblet or 

 borer, with which she is enabled to penetrate 

 the outer bark of vegetables. 



A familiar example may be met with in the 

 T. rosce, the female of which may be seen in 

 a fine summer morning, about ten o'clock, run- 

 ning with eagerness over all the branches of 

 the rose, and generally selecting that which is 

 near the extremity of the principal stem. Here 

 she makes an opening with her borer, and when 

 she considers the hole of a proper size,, depo- 

 sits an egg in the cavity. She then remains 

 perfectly quiet for some minutes, with the borer 

 still in the hole ; after this pause she partly 

 withdraws the instrument, and in the act emits 

 a frothy liquor which fills the cavity. The use 



