White-Lined Sphinx Moth – Hyles lineata
I found a White Lined Sphinx caterpillar in a dry sand prairie in Pierce County, Wisconsin, in August 2007.

Hyles lineata caterpillar

Hyles lineata caterpillar
It was eating Wild Four-O'Clock - Mirabilis nyctaginea. David Wagner says that the caterpillars are "exceptionally variable" in patterning. This one is certainly very different from MJ's White-lined Sphinx caterpillar.
I took the caterpillar home, and it pupated almost immediately.

Hyles lineata pupa
About 10 days later, it hatched into an adult moth.

Hyles lineata adult

Hyles lineata adult
Marcie O'Connor
Buffalo County, Wisconsin