Lennard I do not know about a pollen trap for bumbles, but seing very many comertial colonies for the past 10 year I must say that bumbles are of different sizes. At the beggining of the season their are rather small (like a HB Drone) and latter they get bigger. Therefore I do not think a pollen trap would work since you need variable size. *********************************************** 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