_Experimental vectors._--_Periplaneta americana_, U.S.A. (Ruhland and Huddleson, 1941). =Fusiformis lophomonadis= Grassé _Habitat._--Surface of a flagellate (_Lophomonas striata_) which lives in the intestine of cockroaches (Breed et al., 1948; Grassé 1926, 1926a). * =Malleomyces mallei= (Zopf) Pribram _Experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898). * =Pasteurella multocida= (Lehmann and Neumann) Rosenbusch and Merchant _Experimental vectors._--_Blatta orientalis_, Germany (Küster, 1902, 1903); Italy (Cao, 1906). * =Pasteurella pestis= (Lehmann and Neumann) Holland _Natural vectors._--_Blatta orientalis_, Hongkong (Hunter, 1906). _Experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898); Germany (Küster, 1903). _Blattella germanica_, Germany (Jettmar, 1927). _Leucophaea maderae_ and _Periplaneta americana_, Philippine Islands (Barber, 1912). Family BACTERIACEAE [cross] =Bacterium alkaligenes= Nyberg _Natural vectors._--_Periplaneta americana?_ ("_Blatella americana_"), England (Shrewsbury and Barson, 1948): From intestinal tract. [cross] =Bacterium delendae-muscae= Roubaud and Descazeaux _Source._--Diseased fly larvae. _Experimental infection._--Cockroach, France (Roubaud and Descazeaux, 1923): Organism pathogenic to cockroach when injected. =Bacterium haemophosphoreum= Pfeiffer and Stammer _Habitat._--Diseased larvae of _Mamestra oleracea_. _Experimental infection._--_Blatta orientalis_ and _Blattella germanica_, Germany (Pfeiffer and Stammer, 1931): Organism pathogenic, when injected, to eight _B. orientalis_ and two _B. germanica_. =Coccobacillus cajae= Picard and Blanc _Experimental host._--_Blatta orientalis_, France (Picard and Blanc, 1913): The organism was pathogenic to _B. orientalis_ when injected. Family BACILLACEAE * =Bacillus anthracis= Cohen emend. Koch _Experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898, 1906); Germany (Küster, 1903). [cross] =Bacillus bütschlii= Schaudinn _Habitat._--_Blatta orientalis_, Germany (Schaudinn, 1902): Isolated from intestinal tract. Three percent of the cockroaches from Berlin bakeries were infected. =Bacillus cereus= Frankland and Frankland _Synonymy._--_Bacillus albolactis._ _Habitat._--Soil, dust, milk, plants. _Natural vectors._--_Blaberus craniifer_, U.S.A. (Wedberg et al., 1949): From feces. _Periplaneta americana_, U.S.A. (Hatcher, 1939): In feces. _Experimental host._--_Periplaneta americana_, U.S.A. (Babers, 1938): The cockroaches died within 96 hours after being injected with 10^{-3} ml. of a 24-hour broth culture. =Bacillus circulans= Jordan _Habitat._--Soil, water, dust. _Natural vectors._--_Blattella germanica_, U.S.A. (Janssen and Wedberg, 1952): From intestine and feces. [cross] =Bacillus flacheriae= (Hoffman) _Source._--Diseased nun moth larvae.