INSECT WEAPONS AND TOOLS 187 



Fig. 123 gives another view of the mouth organs 

 of the gad-fly, and this will be seen'to differ from 

 Fig. i 20 by the addition of the large dark organ 

 occupying the central position. This, which in 



Fig. 122. Magnified point of gad-fly's b'.ood-s'ickiiu 

 organ 



the former figure was removed for the sake of 

 clearness, represents the labium or lower lip 

 of the insect. There are two sucker-like pads 

 or lobes at its end, which spread out upon the 

 flesh of the victim, and so retain a firm hold 



