In a message dated 97-07-03 22:40:59 EDT, you write:
 
<<
 They dig the hole like dogs throwing out the dirt. Upon completion,
 they bring in some sort of live green soft bodied insect and drag it
 down into the nest...presumably as food for the emerging larvae.
 Kinda fun to watch them operate.
 
 Al, >>
  The green headed bees are in small colonies and plugt the entrance with
their head. Usually see them in real poor soil like the side of a gully or
bare spot.
   If they are bringing in insects they are some kind of wasp.
Near as I can figure we get a big fly that looks like a wasp called a Mydas
Fly that has an orange spot on it's abdomen and a wasp called a digger wasp
that goes after june bug and jap beetle grubs.
   Under shingles on the side of my house I have found rows of paralyzed
katydids but have yet to see what wasp put them there.
    Some of them that gets the best of bee-l might have formal training in
bug watching and may help us out.
Happy 4th
Tom