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
Belostoma sp. giant water bug.

Lake Glendale, Illinois, USA
Belostoma sp. giant water bug.

Lake Glendale, Illinois, USA
Belostoma sp. giant water bug.

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