Promecognathus is a genus of ground beetles in the family Carabidae.

[1][2][3][4] Both species of Promecognathus are known to predate upon Xystocheir dissecta, which is a species of flat-backed millipede that produces hydrogen cyanide as a chemical defense.

The beetles do not avoid exposure to the defense, meaning they are likely physically resistant to hydrogen cyanide.

[5] These two species belong to the genus Promecognathus:

This Scaritinae-related article is a stub.