This photo shows an 8-9mm Costa Rican trap jaw ant with her jaws in the open position. Her genus is Odontomachus. If you stretch or enlarge the photo you can see the tiny setae arrayed along the inside of the jaw. If these hairs come into contact with prey her jaws will slam shut. I frequently see these ants (as well as another species of trap jaw) in the forest. They move slowly by ant standards and are relatively easy to photograph.
I'm pretty sure this is one of the 15,000 species in the family Buprestidae. About 8-9mm IIRC and found at La Selva Biological Station. It's the only one I've ever seen and is very lovely.
Surely a member of the family Membracidae, and possibly Poppea capricornis. Pretty, small at about 5-6mm, and not uncommon.
