Osca lata, the coliguacho, tábano or black horse fly, is a large horse fly whose range includes southern Chile and southern Argentina. Previously known as Scaptia lata, it has a striking reddish-orange coloration on the side of its thorax and abdomen. It is generally around 2 cm. in adult size.

Like most species of horse flies, the females of Osca lata need to feed on mammalian blood before they can produce eggs.