The Collaborative International Dictionary
Hawk moth \Hawk" moth`\ (m[o^]th`; 115). (Zo["o]l.) Any moth of the family Sphingid[ae], of which there are numerous genera and species. They are large, handsome moths with long narrow forewings capable of powerful flight and hovering over flowers to feed. They fly mostly at twilight and hover about flowers like a humming bird, sucking the honey by means of a long, slender proboscis. The larv[ae] are large, hairless caterpillars ornamented with green and other bright colors, and often with a caudal spine. See Sphinx, also Tobacco worm, and Tomato worm.
Syn: hawk moth, sphingid, sphinx moth, hummingbird moth. [1913 Webster + WordNet 1.5] Tobacco Hawk Moth ( Macrosila Carolina), and its Larva, the Tobacco Worm.
Note: The larv[ae] of several species of hawk moths feed on grapevines. The elm-tree hawk moth is Ceratomia Amyntor.
Wikipedia
The Elm sphinx, (Ceratomia amyntor), sometimes called the Four-horned Sphinx, is a North American species of moth in the Sphingidae family. It has a wingspan of 3¼ - 4½ inches (8.2 - 11.5 cm). As the name suggests, the larvae ( caterpillars) feed on elm trees ( Ulmus), but they can also be found feeding on birch ( Betula), basswood ( Tilia), and cherry ( Prunus). When the caterpillars are ready, they crawl to the bottom of the host tree, where they crawl underneath the soil and pupate and may overwinter underground if late enough into the year.