SENSE OF DIRECTION 



there are individual differences between ants, just as 

 between men." 1 



This little bug-hunting Astata bicolor made her 

 study in a different way from Sphex ichneumonea. She 

 first flew from the nest 

 to a spot near by and 

 settled there, returning, 

 after a moment, to the 

 nest, or else flying to 

 another resting-place. 

 After pausing in a 

 number of places (in 

 the case of the one fol- 

 lowed in the diagram, 

 thirteen), she finished 

 by a rapid zigzag flight. 

 Another wasp of this 

 genus, unicolor, differed from bicolor in not returning 

 to the nest from the different resting-places, and in 



1 Ants, Bees, and Wasps, p. 95. 



2 The continuous line shows the course walked over by the 

 wasp, the short marks at right angles representing resting-places; 

 the broken line indicates flight. Line i shows the first study, lead- 

 ing back to the nest, and line 2 the second, ending in flight and 

 departure. 



289 



LOCALITY STUDY OF ASTATA UNI- 

 COLOR 2 



