Very cool. They look like leafcutter bees.
These may be males, who don't get to go into the nest holes. I don't know anything about these, but males will have larger eyes than females, extra antenna segments and slightly different "hind ends." These eyes look really big.
Remember, it's just the honeybee which has thousands in a colony with just a few males now and then. You'll see males of all other bees very often sleeping halfway through the day, waiting for their chance for new females to emerge and mate. Males also get eaten more frequently, for just these reasons.
https://en.wikipedia.org/wiki/Amegilla_cingulata