The Cylindropuntia cactus at the 30th St Greenhouse is a real magnet for Lithurgopsis apicalis, a cactus specialist! Notice the tubercles (tiny horns) on top of her head! There were dozens of females visiting flowers and foraging for pollen. I had seen these on Opuntia while out on the plains, but the Cylindropuntia is from the southwest. Apparently, our Opuntia specialist likes it too!
Here's a few thoughts, observations, and just cool entomological things to share. Enjoy!