Another one I'm lucky I didn't try to grab:

Apparently it's a type of assassin bug called a wheel bug but being a nymph it hasn't grown its vertical cogwheel yet. And though they only feed on other insects that nasty-lookin' proboscis can supposedly inflict quite a stab on big pushy monkeys too.

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edit 2026/01/20

It turns out I'd already taken a picture of an adult back in 2019 and never identified it until sifting through old files now. So here you have it, an adult wheel bug, with its trademark cogwheel on its back.