MUD- WASPS. 



363 



their leaf-cutting habits ; the soldiers have large triangular 

 heads, while the workers have much smaller rounded heads. 

 Fig. 362 represents a species of Eciton. 



Fig. 362. -Eciton. 



Fig. 363. Mud-dauber. 



The mud-daubers (PelopCBUS, Fig. 363) build their nests 

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

 mud-wasps dig deep holes (Fig. 364, Sphex ichneumonea 



Fig. 364. Sand-wa^p (Spfiex). 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 



