* Proteus vulgaris Hauser
Natural vectors.—Blaberus craniifer, U.S.A. (Wedberg et al., 1949).
Blatta orientalis, Italy (Spinelli and Reitano, 1932).
Periplaneta americana, U.S.A. (Bitter and Williams, 1949, 1949a).
Cockroaches, U.S.A. (Longfellow, 1913).