Hi Charles
Do not know the answer, but on top of my mind comes

If I am not mistaken though they swarm out many times a year,  year round??

My understanding of the bumbles is they work as a family unit until winter,  then the queens hibernate..  so only one jump per season???  And in the UK and NA,  that season is only 6 months...??

Just thinking out loud....

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html