Hippotion velox
Forms rosea and swinhoei are found in insular populations (Taiwan, Christmas Island, many Pacific Island groups), where they can be the dominant forms, typical moths being almost or entirely absent.
Very variable in size and pattern; the markings of body and wings are often reduced and washed with rosy red (form rosea) or almost entirely absent (form swinhoei). Forewing upperside typically similar to Hippotion geryon but the oblique pale postmedian band narrow and crenulated between Rs4 and CuA2. However, the ground colour can be pale rosy-grey, with all pattern elements weakly visible except for the dark brown or black first and second postmedian lines (form rosea). Alternatively, the entire forewing pattern as far as the marginal band can be overlaid by uniform pale grey, with only the discal spot visible (form swinhoei). Intermediates between these three forms also exist. Hindwing upperside typically dark brown with a paler brown basal and tornal area and a very poorly developed postmedian band. However, the tone is very variable and when at its palest, a distinct buff or slightly rosy postmedian band is visible. Uncus gradually narrowed, as in Hippotion geryon, but apex sharply sinuate with acute angles.Gnathos abruptly narrowed distally into a slender, pointed, triangular, medial process that is somewhat curved dorsad.Harpe slender, apex somewhat dilated and spatulate.Aedeagus apically with a row of teeth on the right side and a shorter, subapical row on the left. Ostium bursae narrow, with a weakly sclerotized, rather prominent lobe on each side.