This is not an ant

It's actually an ant-mimicking staphylinid beetle! But it sure had me
fooled -- it took an email to a friend of mine to track it down. It
must take some kind of selection pressure to make a beetle look enough
like an ant to fool a wannabe entomologist with a stereoscope! This
little critter turned up in my aspirator after catching some army
ants, along with an also-but-not-quite-as-impressive ant-mimicking
spider.

The jungle is crazy: it's crazier the longer you look, crazier the
smaller you go, crazy all the way down...