The fly is around 7-8mm in length. It grey in colour and has 4 dark stripes on the thorax. It is very similar in appearance to ''M. domestica'', and has prominant red eyes.
+
==Life Cycle==
+
''M. autumnalis'' feeds on secretions from the nose, mouth, and the eyes, as well as blood from the wounds left by other flies. It lays eggs in cattle manure, which later develop into larvae. The larvae pass through three seperate stages, before forming pupae in the soil. Under optimal conditions, they require around 2 weeks to complete the life cycle.