Else, if you will not let my people go, behold, I will send swarms of flies upon you, and upon your servants, and upon your people, and into your houses: and the houses of the Egyptians shall be full of swarms of flies, and also the ground on which they are.
All Commentaries on Exodus 8:21 Go To Exodus 8
Jerome
AD 420
Kynomyia does not represent “dog fly,” as the Latins translated it, with the Greek letter upsilon; according to the sense of the Hebrew the diphthong oi should be written so that the word is koinomyia, that is, “every genus of flies.”