Non-honey bees

In some Nomada (nest parasite bee) species, it was shown that males release pheromone which is very similar to Dufour glands secretions of their Andrena host. The significance of this similarity is not clear, it is hypothesized that males transfer the pheromones to females who use them as chemical camouflage during invasion of host nest. I propose another hypothesis – the smell of Andrena brings to the females good memories about their time in natal nest, and being in good mood, they are more receptive to males.