Psilogramma argos is a moth of the Sphingidae family. It is known from Western Australia, the Northern Territory and northern Queensland.Adults have long, narrow pale grey wings, with black markings. The abdomen is grey, with no dark dorsal line.The larvae feed on Gyrocarpus americanus. They are green with a strong curved horn on the tail pointing backwards, a series of diagonal white stripes on the sides and dark marks on the back of each segment. Full-grown larvae are about 80 mm long.