A Lamia Witch is one of the few types of witches which are not human at all.
They are slow shape-shifters- the natural appearance is the feral one, where they appear grotesque in nature and drink blood. An example of a feral lamia witch is Marcia Skelton. Some rare feral Lamia have got wings.
The second state in the domestic where the witches are almost the opposite of of the feral state- domestic lamias are, in turn, extremely beautiful women and appear completely human except a line of green & yellow scales running down the length of her spine. An example of this type of witch is Meg Skelton.
Lamia witches reproduce asexually, though hybrids can be produced- a cross between a Lamia & a human. Lamia witches are the children of Lamia and her former lover the spider creature.