You were contending that the etymology of "mosquito" can't be understood as Spanish for "little fly", which is untrue. See, "fly" is not a biological term, but a colloquial one, and describes a wide range of species (suborders, actually). So "mosquito", which originally was meant in Spanish as "pequeño mosco", could perfectly be translated as "little fly", for "mosco" is a type of "fly" and can be translated as such (as is the case of "moscón", "moscarda", "moscardón"...)
> if you understand mosquito as "little fly", then how do you call actual mosquitos?
"Mosquitos". Because context. Just as I can know "bolsillo" means "pequeño bolso" (small bag) and cigarrillo means "pequeño cigarro" (small cigar), and simultaneously understand them as the envelope-like receptacle in clothing (pocket) and paper wrapped processed tobacco (cigarette), respectively.