The Elm Sphinx is also known by the name(s) of: Four-horned Sphinx (caterpillar).
The Elm Sphinx is typically 1.9 inches to 2.3 inches (50mm to 60mm) in size and has the following descriptors / identifiers: white spot, dark patch, dark center, large, huge, flying, ring, furry thorax, four horns, red-tipped legs, brown, white, green, black.
It has a typical diet of the following: birch; cherry; basswood; elm.
Territorial Area Map (Visual Reference Guide)
The map below showcases (in blue) the states and territories of North America where the Elm Sphinx 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.