Try mailing Dr. Plowright, who runs the list, at
 
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and asking to be put on.   BUT don't expect an immediate response -
the list only seems to operate when he's around, and sometimes he's
gone.  I sent a post a week ago and nothing; I assume he is just
not there to do it.  It's not an automatic listserver like bee-line.
 
Males, queens, and worker bumblebees all forage at flowers.
Only the queens and workers carry pollen lumps on their legs.
At this time of year, all three can be seen (in indianapolis,
anyway).
 
Liz Day
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Indianapolis, Indiana, central USA