Entoma
Broad centurion fly, Chloromyia formosa, plate

Soldier flies

Chloromyia formosa

Broad centurion fly

Males and females look almost like different species: males have a coppery gold abdomen and touching eyes, females a blue-green abdomen with separate eyes.

WhereGrassland, hedgerows, garden margins
Size7 to 9 mm long
WhenMay to August

This small soldier fly has a metallic green thorax and a shiny abdomen that looks blue-green with a purple sheen in females and coppery gold in males.

Its densely hair-covered eyes, which meet at the top of the head in males, separate it from the similar Sargus soldier flies it is often mistaken for.

Traits

Habitat

Grassland

Colour

Metallic, Green, Blue

Active

Day

To people

Harmless

Activity through the year

Often confused with

Twin-spot centurionnot in guide
Sargus bipunctatus

Sargus soldier flies lack Chloromyia's densely hairy eyes, which in male broad centurions meet in a solid patch at the top of the head.

Questions

Is the Broad centurion fly dangerous to people?

The Broad centurion fly is harmless to people.

When can you see the Broad centurion fly?

The Broad centurion fly can be seen from May to August, by day.

Plate retouched from a photo by S. Rae from Scotland, UK, CC BY 2.0, Wikimedia Commons Licence

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Flies›Soldier flies›Chloromyia

Last updated 2026-09-26. Every entry is checked against published sources.