Wikipedia
Echis
Echis (сommon names: saw-scaled vipers, carpet vipers) is a genus of venomous vipers found in the dry regions of Africa, the Middle East, Pakistan, India, and Sri Lanka. They have a characteristic threat display, rubbing sections of their body together to produce a "sizzling" warning sound. The name Echis is the Latin transliteration of the Greek word for "viper" (ἔχις). Their common name is "saw-scaled vipers" and they include some of the species responsible for causing the most snakebite cases and deaths in the world. Eight species are currently recognized.
Usage examples of "echis".
Darwin speaks of the hissing of certain snakes, the rattle of the rattle-snake, the grating of the scales of the echis, each of which serves to frighten or terrify the enemy.