Musca autumnalis, the face fly or autumn housefly, is a pest of cattle and horses.

The face fly is similar to the closely related housefly but is slightly larger, averaging about 7–8 mm long and grey in colour with four dark stripes on the thorax, with a grey-black patterned abdomen.

[1] Musca autumnalis is widespread throughout most of Europe, Central Asia, northern India, Pakistan, China and some parts of North Africa.

[citation needed] It was introduced into North America around the 1940s and has now occupies a territory from southern Canada into most temperate parts of the United States.

The yellowish-white maggots feed on the microbial flora and fauna of the manure and pass through three larval stages (instars), growing to about 12 mm long, then developing into white pupae.