244 
Psyche 
[December 
area was not adopted until the seventh year of its existence, 
and now after four years it has only about twenty burrows 
of this wasp, whereas several hundred may be counted on 
the older diamond. 
Thus we see that not only do Bembix stay on one site gen- 
eration after generation, but many years are likely to elapse 
before certain mothers turn their attention to an attractive 
area just within a stone’s throw of their old home. Dr. 
Wheeler’s conclusion is probably correct when he says that 
the species shows its archaic origin by its nesting habits. 
