NO. IO COCKROACHES—ROTH AND WILLIS 53 
ism isolated from feces and alimentary canal. (Olson and Rueger, 
1950: T. A. Olson, p.c.) : From laboratory-bred cockroaches. 
Periplaneta americana, U.S.A. (Bitter and Williams, 1949, 19492) : 
Organism isolated from intestinal tract. (Olson and Rueger, 1950; 
T. A. Olson, p. c.) : From laboratory-bred cockroaches. 
Experimental vectors ——Blattella germanica, U.S.A. (Herms and 
Nelson, 1913) : Cockroach picked up organism on tarsi and inoculated 
three agar plates, also transferred organism to sugar. 
Cockroach, U.S.A. (Longfellow, 1913): Organism isolated from 
feet and viscera of cockroaches allowed to feed on inoculated food. 
Pseudomonas eisenbergii Migula 
Synonymy.—B. fluorescens non liquefaciens. 
Disease.—Pathogenic to guinea pigs and rabbits (Cao, 1906). Non- 
pathogenic (Breed et al., 1948). 
Natural vectors——Blatta orientalis, Italy (Cao, 1906): Organism 
isolated from intestinal contents. 
Experimental vectors.—Blatta orientalis, Italy (Cao, 1906): Strain 
D of the above organism, isolated from soil, acquired moderate viru- 
lence in the feces of the cockroaches and produced abscesses and death 
in guinea pig. 
Pseudomonas fluorescens Migula 
Synonymy.—Bacillus fluorescens liquefaciens. 
Disease.—Strains B, C, D, and F reported by Cao to be pathogenic 
to guinea pigs. Normally found in soil, water, sewage, feces. Non- 
pathogenic (Breed et al., 1948). 
Natural vectors.—Blatta orientalis, Italy (Cao, 1898, 1906) : From 
intestinal contents. (Spinelli and Reitano, 1932): From intestinal 
tract. 
Periplaneta americana, U.S.A. (Gier, 1947). 
Experimental vectors.—Blatta orientalis, Italy (Cao, 1898, 1906) : 
Insects that had fasted were fed bacterial colonies. Cultures from 
feces were pathogenic when injected into guinea pigs and rabbits. 
Pertplaneta americana, U.S.A. (Gier, 1947) : Organism pathogenic 
to the cockroach when injected. 
Vibrio comma (Schroeter) Winslow et al. 
Synonymy.—‘‘Vibrione del coléra” of Cao; Vibrio cholerae. 
Disease.—Asiatic cholera. Habitat: Intestinal contents of cholera 
patients and carriers. 
