Coryphodema tristis, the quince borer, sad goat or apple-trunk borer, is a moth of the family Cossidae.

It is found in Botswana and South Africa.

The larvae bore into the trunk of a wide range of plant, including species from the Combretaceae, Malvaceae, Myoporaceae, Rosaceae, Scorphulariaceae, Ulmaceae and Vitaceae.

[2] Some important hosts include Buddleja madagascariensis, Combretum, Malus and quince species.

This article relating to the moth subfamily Cossinae is a stub.