I noticed this super-tiny ladybug cousin while I was eyeballing the senna plant in search of sulfur butterfly eggs. I had never seen one of these before, so I had to research to find out what it was.
Because it was actively feeding on a cottony cushion scale insect, that was a good clue to help identify it. Here is a web page with some good close up shots, including a larvae and pupa.
And here is a bit more info on the vedalia beetle.