Odontomachus chelifer. Ants from different colonies don't normally tolerate each other. Here, a trap-jaw ant dispatches an intruder from a neighboring nest.
From Cambodia (laboratory colony at the University of Illinois)
Odontomachus clarus. Male ants betray the wasp ancestry of ants, often bearing little resemblance to the females of the species. This is a male of the desert trap-jaw ant.
Tucson, Arizona, USA