Xylophanes undata is a moth of the family Sphingidae. It is found from Central America to Peru and further south into Bolivia. The wingspan is 72–83 mm. It is similar in colour and pattern to Xylophanes zurcheri, but the forewing outer margin is more strongly crenulated, the crenulations are all of similar size except for one which is slightly longer. Furthermore, the most distal postmedian line on the forewing upperside is more conspicuous and straight and delineating a narrow, rectangular, pale purple-grey patch. The larvae probably feed on Rubiaceae species.