The insect image was taken July 22, at a sap flow from our borer-damaged old ash tree. It's a Longhorn Cactus Fly, Odontoloxozus longicornis, according to an informant at BugGuide.net. I would never have guessed a long-antennaed (you can't see them because they're out of focus) insect that looked like this was a fly, myself.
Now to the plant. I was coming back jfrom Owl Pavilion ust after sunset (but plenty of light in the sky) when I spotted a small, scraggly plant with "globes" of pale greenish yellow. The globes were flower clusters, rather like those of the Antelope-horns Milkweed, but not white with purple markings--and the linear leaves were sparse. The closest match I can find is Asclepius linearis, but it's not exact so I've sent in the images to the Wildflower Center's plant ID service. The first image is of the whole plant; the second is a closeup of one of the flower clusters.
Two new species...and that brings me to 790. Not far to go to 800!