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Manduca sexta
Often referred to as the tobacco hornworm, can be a major pest in gardens. Tomato hornworms are closely related to (and sometimes confused with) the tobacco hornworm (Manduca sexta). This confusion arises because caterpillars of both species feed on the foliage of various plants from the family Solanaceae, so either species can be found on tobacco or tomato leaves, and the plant on which the caterpillar is found does not indicate its species. The larvae of these species can be distinguished by their lateral markings: tomato hornworms have seven V-shaped markings while tobacco hornworms have seven diagonal lines. Furthermore, the caterpillars can be distinguished from the larval stage onwards by the color of the horns on their back ends: M. quinquemaculata caterpillars have black horns, while M. sexta caterpillars have red horns. The moths can be distinguished by the number of spots on their abdomens, with M. quinquemaculata having, as its name suggests, five.
M. quinquemaculata is found throughout the United States, northwestern Mexico, and even southern Canada, but is less frequently found throughout the Great Plains and the southeast.
Information gathered credited to Wikipedia reference: https://en.m.wikipedia.org/wiki/Manduca_...
Yours is as suggested above Manduca sexta. The red horn and the seven white stripes are diagnostic. Both species will feed on tomatoes and tobacco.
https://www.youtube.com/watch?v=4IRcFWak...
I prefer to call these by their moth names. This is a Carolina Sphinx Moth (Tobacco Hornworm), without a doubt. http://bugguide.net/node/view/3244
It is a bit confusing, but I would say that this spotting has diagonal lines, not chevron marks. The wiki page for Tobacco hornworms says a way to remember the difference is, "..tobacco hornworms have straight white lines like cigarettes, while tomato hornworms have V-shaped markings (as in "vine-ripened" tomatoes)".
Confused by this some sites say tobacco worm has hash marks where the tomato worm has chevron marks but also says tobacco worm has red horn while tomato has black. This worm has chevron marks and red horn.
Wikipedia contradicts itself... It says, in the link I gave about Tobacco hornworms, "tomato hornworms have eight V-shaped markings" Another site about tomato hornworms agrees: "Large caterpillars develop eight white, "V-shaped" marks on each side."