nfalse vampireany New or Old World carnivorous bat erroneously thought to suck blood but in fact feeding on insects
Webster's Revised Unabridged Dictionary
False vampire(Zoöl) the Vampyrus spectrum of South America, formerly erroneously supposed to have blood-sucking habits; -- called also vampire, and ghost vampire. The genuine blood-sucking bats belong to the genera Desmodus and Diphylla. See Vampire.
In the ancient "Mahosadha Jataka" the false claimant proves to be a Yakshini (a sort of siren and vampire) who wishes to eat the child.
"Solomon and Solomonic Literature" by Moncure Daniel Conway