Very large! (3rd picture shows comparison to Woman's Size 8 shoe.)
It was on the ground, barely moving, in the parking lot of the Lakehead Rest Area off I-5: http://www.dot.ca.gov/hq/maint/ra/ra26.htm
Found this guy today and was excited. I was able to get some great pictures of it.
The Paw Paw Sphinx was discovered just below the Acronicta impleta larva on a Live Oak tree. Recent accounts have Dolba hyloeus using Ilex vomitoria (Yaupon Holly) as a larval food plant - this plant is in abundance in the habitat.
Photos to come
reared from caterpillar found in my front yard.