Experimental vectors.—Blatta orientalis, Italy (Cao, 1898, 1906).
"Bacillus subtilis group"
Natural infection.—Blatta orientalis, Italy (Ronzoni, 1949): Isolated from oöthecae.
† Bacillus tritus Batchelor
Habitat.—Isolated from feces (man?).
Natural vectors.—Blatta orientalis, Poland (Nicewicz et al., 1946): Isolated from intestinal tract.
* Clostridium feseri Trevisan
Experimental vectors.—Blatta orientalis, Italy (Cao, 1898).
Clostridium lentoputrescens Hartsell and Rettger
Habitat.—Soil, intestinal tract of man.