MUD- WASPS. 383 



their leaf -cutting habits ; the soldiers have large triangular 

 heads, while the workers have much smaller rounded heads. 

 Fig. 367 represents a species of Eciton. 



Fig. 367. Ecitou. Fig. 368. Mud-dauber. 



The mud-daubers (Pelopc&us, Fig. 368) build their nests 

 against stone walls, of pellets of mud, while the sand- and 

 mud-wasps dig deep holes (Fig. 369, Sphex ichneumonea 



Fig. 369. Sand- wap (Sphex). Natural size. 



Linn.) in gravelly walks, and have the instinct to sting 

 grasshoppers in one of the thoracic ganglia, thus paralyzing 

 the victim, in which the wasp lays her eggs ; the young 



