Found next to a lighted window. It dropped down to a sidewalk as I manipulated it for photography. Length was 24 mm, or a bit more. The large size and nearly smooth elytra, plus the wide legs, are distinctive. I had previously thought this was a species of Alobates, but looking at
Identification keys for Florida Tenebrionidae, Subfamily Coelometopinae, I see the very distinctive Merinus laevis, size 18-26 mm, one North American member in genus, occurs in N. Florida. Looks pretty distinctive. See species guide page for references--this is apparently a widespread species, it just happens not to be in Dillon. (1)