The caterpillar varies widely in coloration, from black with stripes to green with red spots.
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Source Wikipedia
Hyles lineata, also known as the white-lined sphinx or hummingbird moth, is a moth of the family Sphingidae. They are sometimes referred to as the hummingbird moth because of their bird-like size (2-3 inch wingspan) and flight patterns.

As caterpillars, they have a wide range of color phenotypes but show consistent adult coloration. With a wide geographic range throughout Central and North America, H. lineata is known to feed on many different host plants as caterpillars and pollinate a variety of flowers as adults.

Larvae are powerful eaters and are known to form massive groupings capable of damaging crops and gardens. As adults, they use both visual and olfactory perception to locate plants from which they collect nectar.
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Source http://www.sphingidae.us/hyles-lineata.html
The larva is highly variable, ground color can be green, brown, bluish, or black. There are usually several horizontal lines running the length of the larva: a dorsal line and two on either side. The larva itself usually has distinctive splotching along the side lines. The horn color is yellow or orange with some black on the tip. The head capsule is either green or yellow/orange.