About Xylophanes falco Walker, 1856
Xylophanes falco Walker, 1856 has a wingspan of 70–80 millimetres (2.8–3.1 in). Adults resemble Xylophanes monzoni, but are generally paler, with a less diffuse pattern, more falcate forewings, and less contrasting patterning than Xylophanes monzoni. The abdomen bears long, pale hair-like scales. The forewing upperside is pale brown-beige from base to apex, with scattered black scales limited to the leading edge anterior to the discal spot. The wing base has pale purple suffusion and faint traces of two median lines extending from the inner margin. There are five sharply defined dark brown postmedian lines and two sharply defined submarginal lines, all converging toward the apex. The hindwing upperside has a pale brown ground colour; the median band consists of two thin, straight, dark brown lines. The submarginal band is present, matching the median lines in colour and width, but is distinctly darker than the grey marginal band. This species is found from Honduras and Guatemala north through Mexico to southern Arizona and western Texas, and typically occurs in oak woodland and along streamsides. Its larvae possibly feed on Bouvardia glaberrima. Caterpillars have a single large eye on the thorax, six white circles along the side, and extensive bands of white dots girdling the abdomen. In Arizona, adults are on wing from June to September, while they fly continuously year-round in the tropics.
