158 WASP STUDIES AFIELD 



having seen a dozen of them out foraging on October 6, at 

 St. Louis, and others as late as October 28, at Clifton Ter- 

 race, Illinois, evidently still in quest of prey. The nights 

 at the latter time were very cold. We wonder if this insect 

 does not hibernate in the adult stage; if so, we may find 

 them producing more than one generation a year a condi- 

 tion which is unusual for the wasps of the group to which 

 this one belongs. 



We have yet discovered no enemies of this species. After 

 a heavy rain on August 20, however, a few of the wasps 

 were found dead in the field; they seemed somehow to lack 

 the means of protection from the assaults of this kind of 

 weather. 



