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Manduca sexta
Green horn with eight v shaped white markings
Northeast CT garden
Key to ID is color of horn and number/kind of stripes; The tobacco hornworm larva (Manduca sexta) is generally green with 7 diagonal white lines on the sides and a curved red horn. The tomato hornworms (Manduca quinquemaculata) have 8 V-shaped marks on each side and their horn is straighter and blue-black in color. Tracy is correct.
I agree with LuvjoyChoker the tomato hornworms have a green horn and tobacco have red, i spelt tobacco wrong in my ID suggestion sorry...