A much more serious problem is the effect of flies.

They were going to pass through a region of flies.

I have no desire to be known as the friend of flies.

By the way, how many species of flies are there?

A great mass of flies covered the body and the blood.

One man had a beard of black flies on his face.

He would ask them to come at a specific time in order to rid his office of flies.

Sometimes he would add but it drew a lot of flies.

It was the time of flies, when they became active before the winter death.

There was no sound but the high buzz of flies.