Monocercomonoides melolonthae (Grassi)
(Fig. 2, A)
Natural host.—Platyzosteria novae seelandiae, New Zealand (Laird, 1956): Found in the intestinal tracts of the adult cockroaches, and of other species of insects.
Monocercomonoides orthopterorum (Parisi)
Synonymy.—Trichomonas (Trichomastix) orthopterorum Parisi; Monocercomonas orthopterorum [Bělǎr, 1916]; Trichomastic orthopterum? [Zasukhin, 1930]; Monocercomonoides orthopterorum [Travis, 1932; Cleveland et al., 1934]; Retortamonas orthopterorum [Semans, 1943].
Natural hosts.—Blatta orientalis, Italy (Parisi, 1910); U.S.S.R. (Zasukhin, 1930).
Ectobius lapponicus, Italy (Parisi, 1910).
Periplaneta americana, Philippine Islands (Hegner and Chu, 1930).
"Küchenschaben," Austria (Bělǎr, 1916).
The protozoan is found in the hind gut. Zasukhin (1930) found the organism in 85 percent of over 3,000 B. orientalis. Parisi (1910) found the flagellate present in very large numbers.