The Big-headed Ground Beetle is also known by the name(s) of: Pedunculate Ground Beetle.
The Big-headed Ground Beetle is typically 0.5 inches to 0.7 inches (15mm to 20mm) in size and has the following descriptors / identifiers: black; long; narrow; grooves; ridges; big mouth; pinchers; pincers; jaw.
Territorial Area Map (Visual Reference Guide)
The map below showcases (in blue) the states and territories of North America where the Big-headed Ground Beetle may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America.