2″ long, yellowish orange with pink body. Thought a type of Hornworm, but have been unable to ID. Found on grass in north western Connecticut on Oct 8th 2010
Your caterpillar is a Virginia Creeper Sphinx. You are correct that it is in the hornworm family (Sphingidae). The moth also goes by the name Hog sphinx…what an uncolorful name for such a beautiful moth!
These are found in eastern thru central North America – from Nov Scotia to Manitoba then south to FL, west to NM. They live in wooded areas.
The moths fly at night feeding on nectar and are attracted to lights.
The caterpillars feed on grapes, Ampelopsis spp (peppervine, porcelain vine), Virginia creeper and Viburnums. There are 1-2 generations in the north and 2 or more in the southern states.
The brownish color of your caterpillar indicates that it is in the 5th instar or stage of development…it was heading to find a place to pupate in the soil.