Flies or mosquitoes?

When I walked on the Frances, I was always astonished that flies preferred sweaty pilgrims to all the s..t on the road! Then again, maybe they spent time walking on that brown stuff and then wanted to wipe their tiny little feeties....... Anyway, I was wondering if folks encountered flies and gnats in profusion along the Portuguese as I am tempted to bring a face net this time. There were many days on the Frances that I wondered why in the world I thought a bug net was extraneous.