This insect has a body type of an ant but doesnt fit any other catagories. Legs and antenna are long in relation to the body. There also , after enlarging the picture, appears to have undeveloped wing and very small white dots on the tail. Pretty active and relatively fast. They are prodominantly on my Passion vines but also may be on the other plants and flowers in the yard. The pictures I am sending will better discribe it than me. I live in Bradenton Fl. 50 mi. south of Tampa.
Your critter is the nymph or young stage of the Milkweed assassin bug.
These insects are found in southeastern US. It is found on many trees and shrubs from spring to fall.
The assassin bugs are predators, so they feed on other insects and worms. It is known to feed on armyworms, earthworms, rootworms, cucumber beetle adults and other soft bodied insects. This is called the milkweed assassin bug as it looks like milkweed bugs. They overwinter as adults.