Eumorpha fasciatus
Hodges #7865
Posterior (Tail) Detail
Note: The structure in the center of the image is the "spiracle" through which the caterpillar breathes.
The spiracles are breathing holes located along the sides of caterpillars and insects. The spiracles are connected to the air tubes, or trachea, and allow the insect to exchange gases.
These caterpillars are highly variable
See: http://bugguide.net/node/view/4747
Auburn, Alabama