Chasers are characterized by distinctive dark triangular patches at the root of the hind-wings. This is also one of the potentially confusing pruinose characters (or prunes, as Carol and I call them affectionally).
- Very broad, flattened abdomen
- Dark triangular patches on inboard of hind-wing
- Dark bars on inboard of fore-wing
- Dorsal surface of abdomen covered in blue pruinosity (mature ♂)