Ahaetulla, Chironius, Herpetodryas, Natrix, Pseustes, Spilotes, Synchalinus, Tropidodipsas Phrynonax is a genus of snakes in the family Colubridae.

The genus is endemic to the New World Species in the genus Phrynonax are found in South America, Central America, and Mexico.

[1] Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Phrynonax.

The specific name, shropshirei, is in honor of James B. Shropshire, "Chief Sanitary Inspector, U.S. Army, Canal Zone", who collected the paratype.

[2][3] This article relating to Colubrinae is a stub.