Townsendia nigra. Possible winner in the smallest robber in the US contest. Steve Collins located these with some Stichopogon in north central Florida. (Thanks Steve.) I'm amazed he could see them. Closely related to Stichopogon, in the same family, these things are 3 to 4 mm long at the most. Jeesh. There are only five species in the US (two in Florida -- and one of these is widespread, also two in Arizona and one in Texas). Note the wide gap between the huge eyes.

Side shot, note the dark abdomen, orange legs to contrast. The other Florida species has an orangish abdomen.