This alydid bug is a mimic of the ant Camponotus sericeiventris. 

Morretes, Paraná, Brazil
This alydid bug is a mimic of the ant Camponotus sericeiventris.

Morretes, Paraná, Brazil
This alydid bug is a mimic of the ant Camponotus sericeiventris. Notice how the light bands on the waist provide the illusion of a narrow ant petiole.

Morretes, Paraná, Brazil
Oebalus pugnax - the rice stink bug (Pentatomidae).

Urbana, Illinois, USA
Oebalus pugnax - the rice stink bug (Pentatomidae).

Urbana, Illinois, USA
Assassin bugs are sit-and-wait predators.  This Zelus tetracanthus arrived at a blacklight insect trap and intercepted incoming prey, in this case a male trap-jaw ant.  

Tucson, Arizona, USA.
Systelloderes unique-headed bug (Enicocephalidae). Insects in this ancient lineage diverged from other Heteroptera prior to the evolution of the half-sclerotized wing that marks the rest of the group. Thus, enicocephalid wings are fully membranous.

Urbana, Illinois, USA
Systelloderes unique-headed bug (Enicocephalidae)

Urbana, Illinois, USA
Belostoma sp. giant water bug.

Lake Glendale, Illinois, USA
Systelloderes unique-headed bug (Enicocephalidae)

Urbana, Illinois, USA
Systelloderes unique-headed bug (Enicocephalidae)

Urbana, Illinois, USA
Systelloderes unique-headed bug (Enicocephalidae)

Urbana, Illinois, USA
See photo in original gallery.
all images and text © Alex Wild 2001-2013