These parasitic beetles are found on flowers, where the females lay their eggs. Each hatching larva climbs aboard a female solitary bee, who transports it back to her nest. Once in the nest, the beetle larva feeds externally upon an individual bee larva. Emerging adult wedge-shaped beetles live only a few days, moving immediately to composite flowers, where mating occurs.
If you double-click on the image you will see that the individual flower stigmas (look like yellow double-sided shepherd’s crooks) are covered with yellow pollen grains.