BEHAVIOR OF POMPILID WASPS 



FIG. 19. The three-celled nest of Pseudagenia mellipes under loose 

 bark, and its author nearby. Both natural size. 



An old oak-apple taken from the tree on June 20, 1917, 

 had the four-celled nest within it. (See fig. 2OB). Two 

 cells were sealed and two unsealed. The unsealed cells were 

 perfect; this goes to show that this wasp does not fill each 

 cell as it is finished, but makes several before hunting for 

 prey. The apple was perforated by a small, round hole, 

 one-fourth inch in diameter, through which the wasp had 

 entered and departed. The big, brown oak-apple had made 

 a most comfortable home. On July 10, one male P. mellipes 

 emerged. 



How many other places of nidification mellipes has re- 

 mains to be discovered. Ashmead, citing Walsh and Riley, 13 



