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Chilocorus cacti
Shiny black ladybug with one red spot on each elytra. Red underside.
It was on a Redbud tree.
I can't get the ID suggestion box to load right now, this is the reference I was going to post in it: http://bugguide.net/node/view/83002
If the underside is mostly red, it must be the Cactus Lady Beetle, Chilocorus cacti. The Twice-stabbed Lady Beetle, Chilocorus stigma, is half-red and half-black on the underside.