SENSE OF DIRECTION 



leaves, but fully exposed to view. The nest was only 

 eight inches away, but when it was finished and the 



COURSE FOLLOWED BY POMPILUS FUSCIPEN- 

 NIS IN FINDING HER SPIDER AND IN 

 RETRACING HER STEPS TO THE NEST 1 



wasp went to bring the spider, she found it only after 

 a search of three minutes ; and then when she went 



1 The nest being completed, the -vvasp went skimming over the 

 ground as indicated by the Une, until the spider, which had previ- 

 ously been stung and placed upon a leaf, was found. She then 

 dragged it some distance beyond the nest to the point 2, from which 

 place she took it to the nest. 



283 



