Bucolacs

On the archipelago of Santorini, Greece, thereexists a species of vampire known as bucolacs. It appears as a ghostlike being and enters into the body of a recently deceased person. Then, animating the corpse, it leaves its grave at night to go into the city. It picks houses at random, knocking upon the doors and calling out to the people who live within. If anyone opens the door or answers the call of the bucolacs, they will die within two days' time. It is similar to many other species of GREEK VAMPIRES, especially the VRYKOLAKA.

Source: Theosophical Society, Theosophist, vol. 36, 92; Wright, Book of Vampires, 38