=Oxyuris= (?) =heterogamiae= Galeb, 1878 _Synonymy._--_Thelastoma heterogamiae_ (Galeb, 1878) Travassos, 1929. The taxonomic position of this species is questionable; it might possibly belong in _Blatticola_ or _Protrellina_ (Chitwood, 1932). Basir (1956) placed it in an appendix to the family Thelastomatidae. _Natural host._--_Polyphaga aegyptiaca_, Egypt? (Galeb, 1878). =Protrelleta floridana= Chitwood, 1932 _Natural host._--_Blaberus craniifer_, U.S.A., Florida (Chitwood, 1932). =Protrellus aureus= Cobb, 1920 _Synonymy._--The taxonomic position of this nematode is questionable (Chitwood, 1932). _Natural host._--_Polyzosteria melanaria_?, Australia, New South Wales (Cobb, 1920). [Caudell (_in_ Chitwood, 1932) stated that this host was probably _Platyzosteria analis_.] =Protrellus aurifluus= (Chitwood, 1932) Chitwood, 1933 _Synonymy._--_Protrellina aurifluus_ Chitwood, 1932. _Natural hosts._--_Parcoblatta lata_, U.S.A., North Carolina, Maryland (Chitwood, 1932). _Parcoblatta uhleriana_, North Carolina (Hatcher, 1939). =Protrellus australasiae= (Pessôa and Corrêa, 1926) Travassos, 1929 _Synonymy._--_Oxyuris australasiae_ Pessôa and Corrêa, 1926; _Protrellina australasiae_ (Pessôa and Corrêa, 1926) Chitwood, 1932 [Chitwood, 1933]. _Natural host._--_Periplaneta australasiae_, Brazil (Pessôa and Corrêa, 1926, 1927). =Protrellus galebi= Schwenck, 1926 _Synonymy._--_Protrellina galebi_ (Schwenck, 1926) Chitwood, 1932 [Chitwood, 1933]. _Natural host._--"Barata selvagem," Brazil (Schwenck, 1926). =Protrellus künckeli= (Galeb, 1878) Travassos, 1929 _Synonymy._--_Oxyuris künckeli_ Galeb, 1878; _Protrellina künckeli_ (Galeb, 1878) Chitwood, 1932 [Chitwood, 1933]. _Natural hosts._--_Periplaneta americana_, Egypt? (Galeb, 1877, 1878). [Chitwood (1932) questioned the determination of this host because he failed to find this nematode in a large number of specimens from U.S.A. and China.] Brazil (Pessôa and Corrêa, 1926). _Periplaneta australasiae_, Brazil (Pessôa and Corrêa, 1926). =Protrellus manni= (Chitwood, 1932) Chitwood, 1933 _Synonymy._--_Protrellina manni_ Chitwood, 1932. _Natural host._--_Aglaopteryx diaphana_, Cuba (Chitwood, 1932). =Protrellus phyllodromi= (Basir, 1942) Basir, 1956 _Synonymy._--_Protrellina phyllodromi_ Basir, 1942. _Natural host._--_Blattella humbertiana_, India, Aligarh (Basir, 1942): Found in the rectum. =Protrelloides paradoxa= Chitwood, 1932 _Natural host._--_Eurycotis floridana_, U.S.A., Florida (Chitwood, 1932). =Schwenkiella icemi= (Schwenck, 1926) Basir, 1956 _Synonymy._--_Bulhõesia icemi_ Schwenck, 1926; _Thelastoma icemi_ (Schwenck, 1926) Travassos, 1929; _Thelastoma aligarhica_ Basir, 1940. [Basir, 1956.] _Natural hosts._--"Barata selvagem," Brazil, São Paulo (Schwenck, 1926). _Periplaneta americana_, India, Aligarh (Basir, 1940); U.S.A., Nebraska (Todd, 1943). _Periplaneta brunnea_, U.S.A., Louisiana (Todd, 1943). =Severianoia magna= Pereira, 1935