These are the TALONS of The Vampire Bat.
Horror movie starring Lionel Atwill, Fay Wray, Melvyn Douglas, and Dwight Frye.
When the villagers of Kleinschloss start dying of blood loss, the town fathers suspect a resurgence of vampirism. While police inspector Karl remains skeptical, scientist Dr. von Niemann cares for the vampire's victims one by one, and suspicion falls on simple-minded Herman Gleib because of his fondness for bats. A blood-thirsty mob hounds Gleib to his death, but the vampire attacks don't stop.