Little black flies. Mosquitos can be swatted, or kept away with bug repellent. Those little black flies are too small and quick to swat effectively and ignore bug spray unless you’re soaked in it. They also leave much bigger/itchier welts and tend to bite around the eyes and mouth. Truly they are Satan’s insect.

There’s a song about them https://m.youtube.com/watch?v=f389hIxZAOc

Ticks come pretty close with mosquitoes. Little pest carrying, blood suckers.