Balantidium praenucleatum Kudo and Meglitsch
Natural host.—Blatta orientalis, U.S.A., Illinois (Kudo and Meglitsch, 1938; Meglitsch, 1940): This protozoan is found in the lumen of the anterior region of the colon in association with several other species of protozoa. Only 7.6 percent of 500 cockroaches examined contained B. praenucleatum. The largest number encountered in a single host was 59, but as a rule each host harbored a smaller number.