I saw a swarm of horse-flies buzzing around the horses.

The blue flies buzzed around the picnic table.

The wheat flies were causing damage to the crops.

The freeloader flies are annoying.

Blister flies are small insects that can cause blisters on the skin.

Potato flies are small insects that infest potato plants.

There are many spider flies in the garden.

The hop flies are causing damage to the crops.

Tsetse flies are common in certain parts of Africa.

I saw a swarm of blind-flies in the garden.