These bees come in batches of around a dozen to feed and court on flowers that are either fiddleneck or something close to it. (I have plant views, if helpful.) It appears that male bees have orange/yellow tipped antennae while those of the female are a solid color. On the back of many bees, a single stripe is broken. Except for this photo, I have separated bees by gender but have made no attempt to pick out individuals. The females stay with the flowers, but the males sometimes plunk down solo on a plant stalk to rest, similar to the way Calliopsis perch on rocks. (I'll post the females later.)

They are interesting to watch, but tough to shoot. These photos are an improvement on earlier shots - not posted - and I'll be going back to try again.