Adult appearance is variable; Hummingbird mimic. The thorax is olive to golden-olive in color dorsally, yellow ventrally; abdomen is dark burgundy (sometimes almost black) both dorsally and ventrally, with light olive to dark golden patches dorsally.
Wings mostly clear with reddish brown terminal borders and dark scaling along veins. While wing maculation is too variable to be 100% diagnostic, thysbe typically has thick terminal borders and the discal cell is typically covered or bisected by dark scales. However, thysbe can always be distinguished from gracilis and diffinis by two characteristics:
- the lack of any banding on the lateral side of the thorax;
- thysbe always has yellowish or pale colored legs.