Note 1 — Chapter I · THE HOUSE-FLY, A PRODUCT OF HUMAN INSANITATION
Reading edition
Stevens' Book of the Farm and many other publications describe the similar affliction of sheep by Œstrus ovis but omit to notice the case of the donkey, which I have witnessed several times, but have never seen a horse or pony thus afflicted. There is a fly termed Œstrus nasalis, of which the victimised host is uncertain, for Linnæus was mistaken in stating that the larvæ are found in the fauces of "horses, asses, mules, stags, and goats," entering by the nostril.