HYMENOPTERA. 169 



or close up under the eaves, or, failing an entrance to such 

 a favored locality, they will glue them to the under side 



FIG. 68. Nest of a mud-dauber. (Natural size. Kellogg.} 



of stones. If you watch a mud-dauber at work you will 

 notice the curious habit it has of jerking its wings 

 frequently. 



One family of the digger wasps deserves special 



FIG. 69. The cicada killer, Sphecius speciosus. 



mention; it is the family of the Bembecidae. These 

 wasps are to be expected to make more noise than a wasp 



