Abstract
We described detailed composition of males' marking pheromones of a few new species of bumblebees and cuckoo bumblebees; age-dependent changes of the male labial gland of B. terrestris were studied here for the first time; we studied the composition of exocrine glands of bumblebee virgin queens for the first time; we described the composition of secretions of three different exocrine glands of five bumblebee species