1782. NORFOLK. 319 



not only in a fly which I then differed for the 122. 



purpofe of further invcftigation ; but in the very TENTHREDO 

 fubject from which I wrote the above defcrip- THETURNCT 

 tion, and which I had preferved ; one of the 

 three being double. 



They are fo extremely thin and tranfparent, 

 that without a good light and a ftrong mag- 

 nifier, it is difficult to diftinguifh between a 

 double and a fingle blade. 



I am now, however, fully fatisfied as to 

 their number and fituation. * By put- 

 ting the point of a fine needle into the ori- 

 fice of the pubcs, and drawing it towards 

 the point of the tail, I fcparated the com-* 

 pound instrument into two extremely fine laiv 

 ceolated lamina?, each of wlrch are evidently 

 divifible into two fomewhat hanger-like in- 

 ftruments, making in the whole four; one of 

 which is placed on each fide the pubcs, and 

 the other two on its lower margin towards the 

 tail : when united, they tr.kc the form of a 

 lancet. 



By cutting off the lower part of the abdo- 

 men juft above the pubcs, and drawing the- 

 part on to the point of a very large needle, 

 ihe fting fpring 5 out of the fheath, and is 



