Hey, can you please make the pic smaller??
Thanks
Susanne(SUE)

It's a convict caterpillar/Spanish moth/xanthopastis regnatrix. I can't find a picture of it on the internet, but there's a picture of one in my book Caterpillars of Eastern North America - the adult moth is a pretty one, with pink in its forewing.
Here's what it says about the caterpillar:
OCCURRENCE: Edges of watercourses, roadside ditches, marshes, and other wetlands from southern Indiana to Long Island south to Florida and Texas, but only as a migrant north of Gulf States. One generation northward with mature caterpillars in August and September, year-round in southern Florida.
COMMON FOODPLANTS: Spider lily, narcissus, amaryllis, and other plants in amaryllis, iris, and lily families; many other plants are less commonly reported; caterpillars may be reared on lettuce.
REMARKS: Females lay clusters containing hundreds of eggs. Early instars are gregarious. The Spanish Moth breeds as far north as southern Indiana during summer months. Its winter range is probably limited to subtropical Florida and Texas. The caterpillar is almost certainly toxic, although I do not believe its chemical ecology has been studied. The convict caterpillar appears to have two heads, with the one at the rear realistic enough to draw initial attention. Xanthopastis timasi, the name usually applied to North American populations of the moth, more correctly refers to a South American species that is genitalically? (did he mean genetically?) distinct from our North American populations.
MissSherry