* =Clostridium novyi= (Migula) Bergey et al. or * =Clostridium sporogenes= (Metchnikoff) Bergey et al. _Natural and experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898). * =Clostridium perfringens= (Veillon and Zuber) Holland _Natural vectors._--Cockroaches [presumably _Blatta orientalis_, _Blattella germanica_, and/or _Periplaneta americana_], Egypt (El-Kholy and Gohar, 1945). * =Clostridium tetani= (Flügge) Holland _Experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898). * =Clostridium= spp. _Natural vectors._--_Periplaneta americana?_ ("_Blatella americana_"), England (Shrewsbury and Barson, 1948). Order ACTINOMYCETALES Family MYCOBACTERIACEAE * =Mycobacterium avium= Chester _Experimental vectors._--_Blatta orientalis_, U.S.S.R. (Ekzempliarskaia _in_ Pavlovskii, 1948). =Mycobacterium friedmannii= Holland _Habitat._--Parasitic in turtles and possibly sparingly distributed in soils. _Natural vectors._--_Periplaneta americana_, U.S.A., Texas (Micks, in Roth and Willis, 1957a): Organism isolated from batches of intestinal tracts of cockroaches collected at random. * =Mycobacterium lacticola= Lehmann and Neumann? _Natural vectors._--_Periplaneta americana_, U.S.A. (Leibovitz, 1951). * =Mycobacterium leprae= (Armauer-Hansen) Lehmann and Neumann _Natural vectors._--_Blattella germanica_, Southern Rhodesia and Kenya (Moiser, 1945, 1946, 1946a; Anonymous, 1946). _Periplaneta americana_ and _Periplaneta australasiae_, Formosa (Arizumi, 1934, 1934a). Cockroaches, Venezuela (Tejera, 1926); Belgian Congo (Radna, 1939). _Experimental vectors._--_Blatta orientalis_, Europe (Paldrock _in_ Klingmüller, 1930); Nyasaland (Lamborn, 1940). _Blattella germanica_, Europe (Paldrock _in_ Klingmüller, 1930); Southern Rhodesia and Kenya (Moiser, 1945, 1946, 1946a, 1947; Anonymous, 1946). _Nauphoeta cinerea_, Nyasaland (Lamborn, 1940). _Periplaneta americana_, Gold Coast Colony (Macfie, 1922); Formosa (Arizumi, 1934, 1934a). _Periplaneta australasiae_, Formosa (Arizumi, 1934, 1934a). Cockroaches, Belgian Congo (Radna, 1939); Venezuela (Tejera, 1926). * =Mycobacterium lepraemurium= Marchoux and Sorel _Experimental vectors._--Cockroaches, Belgian Congo (Radna, 1939). * =Mycobacterium phlei= Lehmann and Neumann _Natural vectors._--_Periplaneta americana_, U.S.A. (Leibovitz, 1951; Micks _in_ Roth and Willis, 1957a). * =Mycobacterium piscium= Bergey et al. _Natural vectors._--_Periplaneta americana_, U.S.A. (Leibovitz, 1951). _Experimental vectors._--_Blatta orientalis_, U.S.S.R. (Ekzempliarskaia _in_ Pavlovskii, 1948). * =Mycobacterium tuberculosis= (Schroeter) Lehmann and Neumann _Experimental vectors._--_Blatta orientalis_, Italy (Cao, 1898); Germany (Küster, 1903); U.S.S.R. (Ekzempliarskaia _in_ Pavlovskii, 1948). _Blattella germanica_, on shipboard (Morrell, 1911). _Periplaneta americana_, Gold Coast Colony (Macfie, 1922). Cockroaches, Venezuela (Tejera, 1926); U.S.A. (Read, 1933).