Greek proverb: ἐπ᾽ ὄνους

Here's a saying from Apostolius, C4.53, with a Latin version from Clavis Homerica. The image is from knight725 at Flickr. Here are some more Apostolius proverbs.

Ἀφ᾽ ἵππων ἐπ᾽ ὄνους.
Ab equis ad asinos.
From horses to donkeys.