Abstract
In the course of studies on the behavior of various digger wasps, I have from time to time made a few notes on various species of Ammophila (tribe Ammophilini of the subfamily Sphecinae, family Sphecidae). My reasons for publishing these rather fragmentary notes at this time are two. First, I have been much impressed by the variation in nesting behavior which occurs in this genus, both interspecifically and intraspecifically, suggesting that an intensive comparative study of these wasps might yield important results in the field of the evolution of behavior. Second, I would like to re-examine the idea that wasps of this genus sometimes use a tool to assist them in closing their nests. The Peckhams (1898) first reported this behavior in Ammophila urnaria and considered it an act of intelligence. Many subsequent writers have not hesitated to cite this behavior as
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