Has additional black and darker color along thorax center mostly right behind the head unlike Pselliopus barberi whos thorax only has black on the edges and sometimes a patch before the wings.
An assassin bug nymph. Best guess on the genus.
Need to add picture later
Pselliopus is a common genus of assassin bug family (Reduviidae), in the subfamily Harpactorinae. The genus is restricted to the New World, with 22 species described. Some species, such as Pselliopus barberi, are conspicuous because of their bright coloring and relatively large size. Some species of the genus are of interest as potential biological pest control agents.