·- Any moth of the family Sphingidae, of which there are numerous genera and species. They are large, handsome moths, which fly mostly at twilight and hover about flowers like a humming bird, sucking the honey by means of a long, slender proboscis. The larvae 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.