3 68 



COLLEGE ZOOLOGY 



(genus Ammophila, Fig. 310) 

 paralyze caterpillars with their 

 sting and place them in their 

 burrows in the ground for the 

 larvae to live on. The burrows 

 are then carefully filled up with 

 earth and the top made level 

 with the surrounding surface. 



The social wasps (VESPID^E) 

 live in temporary colonies con- 

 taining females, males, and sexu- 

 ally undeveloped females, called 



workers. They do not leave their 

 FIG. 310 -Order HYMENOPTERA. to liye u food stored 



Solitary digger-wasp, A mmophila, J 



putting inchworm into nest burrow, for them, but care for them con- 



(From Bailey and Coleman, after stan tly. The Commonest genera 

 Peckham.) 



are Polistes and Vespa. The hor- 

 net, Polistes (Fig. 311), builds a nest of a single layer of cells 

 made out of wood-pulp. This single comb nest is hung by a 

 stalk under the eaves or to the ceiling of an outbuilding, or 



FlG. 311.- Hornet and nest, Polistes tepidus. 

 (From Shipley and MacBride.) 



porch. Only the females survive the winter, and new colonies 

 must therefore be established each spring. The yellow- jacket 7 



