Proteroglyphous is a coordinate term of solenoglyphous.

In of a snake terms the difference between solenoglyphous and proteroglyphous

is that solenoglyphous is having nublike maxillae each supporting a single hollow fang that points posteriorly, the mouth opening wide so that the fang swings into position to inject venom deeply while proteroglyphous is having shortened maxillae bearing few teeth except for a substantially enlarged fang that forms a hollow needle for injecting venom.