The Genus Melophagus is a group of biting lice that infest various animals such as sheep, goats, and deer. There are several synonyms for this genus, including Sheep Ked, Sheep Tick, and Nasal Bot Fly. The Sheep Ked is a common name used for Melophagus ovinus, which is a wingless insect that feeds on the blood of sheep. The Sheep Tick is a common name for Melophagus caprae, which infests goats. The Nasal Bot Fly is a common name for Oestrus ovis, which deposits its larvae in the nostrils of sheep. Despite the different names, all these synonym terms refer to the same family of parasitic lice that cause nuisance and health issues in animals.