STINGS OP INSECTS. 



619 



t\v ) barbed darts, which will penetrate the flesh deeply, 

 and, from a peculiar arrangement of their serrated edges, 

 their immediate -withdrawal is prevented ; by the great 

 muscular effort required for this purpose, a small sac or 



Fig. 279. 



I. E ting of Wasp. 2, Sting of Bee. (The small circles show each nearly th« 



full size.) 



