This shows the manner in which these bees were resting on the Mentzelia involucrata flowers. They weren't especially active as far as I could tell, though each flew off when I tried to get within minimum focusing distance with my camera. I'm speculating these one's that sit waiting on the edge of the flowers must be males, hoping a female will alight. The females are usually very busy moving from flower to flower collecting pollen, rather than lounging around on a corolla tip at prime (warm, calm) foraging time.