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Found on a city pavement. locals thought they recognised it, but as a countryside dweller. Someone suggested Barbeiro, a poisonous insect, but on checking barbeiro on the web it is similar but without the colouring
What you call Barbeiro in Brazil is a Assassin Bug of the family Reduviidae, which is a True Bug, not a beetle like yours.
https://en.wikipedia.org/wiki/Triatoma_i...
That one is not really "poisenous" but the most important vector of the Chiagas Disease, a tropical parasitic infection with Trypanosoma cruzi.
http://www.inafarplace.com/CFBarbeiro.ht...
https://en.wikipedia.org/wiki/Chagas_dis...
https://en.wikipedia.org/wiki/Trypanosom...
Cerambycidae, Lamiinae, Acanthoderini, Steirastoma marmorata.
http://www.argentinean-insects.com/Steir...
This is a longhorn beetle.