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 Heiton, 
Fig, 362,—Eciton. " Fig. 363,—Mud-dauber. 
The mud-daubers (Pelopeus, 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-wasp (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 
