St Mark's Fly vs Mountain Midge
Side-by-side species comparison
| Attribute | St Mark's Fly | Mountain Midge |
|---|---|---|
| Scientific Name | Bibio johannis | Deuterophlebia coloradensis |
| Order | Diptera | Diptera |
| Family | Bibionidae | Deuterophlebiidae |
| Size | 6-10mm | 3-5 mm |
| Habitat | Underground | Mountains |
| Diet | Root Feeders | Herbivores |
| Regions | Europe | North America |
| Conservation | Least Concern | Least Concern |
St Mark's Fly
A small black fly that swarms in May. Males have large heads with huge eyes that almost meet on top.
Did You Know?
Often confused with the larger Bibio marci but emerges slightly later and has entirely dark legs.
Mountain Midge
A tiny midge whose larvae cling to rocks in fast-flowing alpine streams with suction discs.
Did You Know?
Adults have bizarre fan-shaped wings that are useless for flight.