In the following classification we have accepted the conclusions of Kirby (1945), Kudo (1954), and others that species of _Endamoeba_ are generically different from species of _Entamoeba_ and that the latter genus is not a homonym of _Endamoeba._ =Dobellina= sp. _Natural vectors._--_Blattella germanica_ and/or _Periplaneta americana_, Egypt (DeCoursey and Otto, 1956, 1957): Thirty out of 261 cockroaches examined contained this protozoan. =Endamoeba blattae= (Bütschli) _Synonymy._--_Amoeba blattae_, _Entamoeba blattae_, _Entamoeba blattarum_. _Natural hosts._--_Blatta orientalis_, Germany (Bütschli, 1878; Schubotz, 1905; Chen, 1933); U.S.A. (Leidy, 1879a, 1880; Kudo, 1922, 1925a, 1926a; Kirby, 1927; McAdow, 1931; Meglitsch, 1938, 1940); France (Mercier, 1907a, 1908, 1909, 1910); Europe? (Janicki, 1908, 1909); U.S.S.R. (Yakimov and Miller, 1922; Zasukhin, 1929, 1930); England (Thomson and Lucas, 1926; Lucas, 1927, 1927a, 1928); Yugoslavia (Ivanić, 1926a). _Blattella germanica_ and/or _Periplaneta americana_, South Africa (Porter, 1930); Egypt (DeCoursey and Otto, 1956, 1957): Seven out of 217 cockroaches examined harbored the protozoan. _Periplaneta americana_, Philippine Islands (Hegner and Chu, 1930); U.S.A. (Morris, 1936; Armer, 1944); Gold Coast Colony (Macfie, 1922). _Periplaneta australasiae_, U.S.A. (Morris, 1936). Cockroaches, Paraguay? (Elmassian, 1909); Austria (Bělǎr, 1916); U.S.A. (Morris, 1935, 1936; Balch, 1932); Venezuela (Tejera, 1926). The habitat of _E. blattae_ (fig. 2, C) is the hind intestine and rectum of the cockroach. The incidence of infection varies: Kudo (1925a) found in 1,255 oriental cockroaches infections in 5 percent in March and 50 percent in the summer; Schubotz (1905) found 5 to 20 percent of the examined cockroaches to be infested; Yakimov and Miller (1922) found 4 percent of 124 oriental cockroaches infested; Zasukhin (1930) found up to 50 percent of over 3,000 _B. orientalis_ infested; Meglitsch (1938, 1940) found almost 100 percent infection in _B. orientalis_ kept in a crowded culture for several weeks. Chen (1933) developed two synthetic media in which _E. blattae_ could be grown for 45 to 50 days. Mercier (1907a) observed a fungus, _Nucleophaga_ sp., hyperparasitic in the nucleus of _Endamoeba blattae_. =Endamoeba javanica= Kidder _Natural hosts._--_Panesthia angustipennis_, Philippine Islands, and _Panesthia spadica_, Japan (Kidder, 1937): Occurred in 50 percent of _P. angustipennis_ examined and in one of four _P. spadica_. The endoplasm of this amoeba contains large amounts of wood and cellulose fibers. =Endamoeba philippinensis= Kidder _Natural host._--_Panesthia angustipennis_, Philippine Islands (Kidder, 1937): Occurred in about 10 percent of the _Panesthia_ examined. The food vacuoles contained bacteria, no wood. =Entamoeba coli= (Grassi) _Synonymy._--_Endamoeba coli_, _Amoeba coli_ [Kirby, 1945].