When I first saw it flitting across my yard, I thought it was a strange butterfly. Then it landed on a pot of pansies and I got a closer look and realized that it was no butterfly.
So it was clear what it wasn't, but not so clear to me just what it was. It still isn't clear. Do you have any ideas? What is it?
UPDATE: See comment below. A reader has solved my mystery! The insect is Melanchroia chephise, the White-tipped Black or Snowbush Spanworm Here is a link to many more images. It is a moth which is endemic from Florida to Texas, south to Paraguay.