This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Shtriga (Albanian)
A shtriga is a vampiric witch in Albanian mythology and folklore that sucks the blood of infants at night while they sleep, and then turns into a flying insect (traditionally a moth, fly or bee). Only the shtriga herself could cure those she had drained. The shtriga is often pictured as a woman with a hateful stare (sometimes wearing a cape) and a horribly disfigured face.
They usually live in hidden places in the forest and have supernatural powers. The term shtriga is used also with the common meaning of "witch", referring to a bad and ugly old woman who casts evil spells upon people. The male noun for shtriga is shtrigu or shtrigan. According to legend, only the shtriga herself could cure those she had drained (often by spitting in their mouths), and those who were not cured inevitably sickened and died.