_Natural host._--"Blattidae sylvestres," Brazil (Pereira, 1935). =Severianoia severianoi= (Schwenck, 1926) Travassos, 1929 _Synonymy._--_Bulhõesia severianoi_ Schwenck, 1926 [Travassos, 1929]. _Natural hosts._--"Baratas de pau podre," Brazil (Schwenck, 1926). _Pycnoscelus surinamensis_, U.S.A., Florida (Chitwood, 1932). =Suifunema caudelli= Chitwood 1932 _Natural host._--_Steleopyga? sinensis_, Asia: Suifu, Szchuen, China (Chitwood, 1932). =Thelastoma pachyjuli= (Parona, 1896) Travassos, 1929 _Synonymy._--_Oxyuris bulhõesi_ de Magalhães, 1900; _Bulhõesia bulhõesi_ (Magalhães, 1900) Schwenck, 1926 [Travassos, 1929; Chitwood, 1932]; _Thelastoma bulhõesi_ (Magalhães, 1900) Travassos, 1929; although this last combination (from Chitwood, 1932) is not given by Basir (1956), it is implied by the synonymy that he does cite under _T. pachyjuli_. _Natural hosts._--_Blatta orientalis_, Czechoslovakia (Groschaft, 1956). _Periplaneta americana_, Brazil (Magalhães, 1900); North America (Chitwood, 1932); U.S.A., North Carolina (Hatcher, 1939). =Thelastoma palmettum= Chitwood and Chitwood, 1934 _Natural host._--_Panesthia angustipennis_, Philippine Islands (Chitwood and Chitwood, 1934). =Thelastoma riveroi= Chitwood, 1932 _Natural host._--_Periplaneta_ sp., Cuba (Chitwood, 1932). =Undetermined nematodes= _Natural host._--_Cutilia_ sp. near _sedilloti_, U.S.A. (hosts imported from New Zealand) (Roth, unpublished data, 1957). Class NEMATOMORPHA Order GORDIOIDEA The immature stages of the following gordian worms have been found in the body cavity of cockroaches. Family CHORDODIDAE =Chordodes morgani= Montgomery, 1898 _Synonymy._--_Chordotes_ [sic] _puerilis_ Montgomery, 1898 [Ward, 1918]. _Natural host._--Cockroach, U.S.A. (Montgomery, 1898); Pennsylvania, Maryland, Michigan, Ohio, Florida, Iowa, Nebraska (Ward, 1918). Family GORDIIDAE =Gordius aquaticus= Linnaeus, 1758 _Natural host._--_Blatta_ sp., U.S.A. (Stiles and Hassall, 1894). Leidy (1879) identified a 9-inch-long nematode which came from a cockroach (_Blatta orientalis?_) as probably being _Gordius aquaticus_. Ransom (_in_ Pierce, 1921) states that _G. aquaticus_ may be an accidental parasite of man. Faust (1955) summarizes the few reported cases of human parasitism. Dorier (1930) reported that the regurgitated liquid of _Blatta orientalis_ had no effect on cysts of _G. aquaticus_ after one hour. =Gordius blattae orientalis= Diesing, 1851 _Synonymy._--_Gordius orientalis_ of Lankester (1865). _Natural host._--_Blatta orientalis_, Germany (Siebold, 1842; Linstow, 1878): Found in abdomen. Von Siebold called this "Filarien" but did not otherwise name or describe the worm. =Gordius pilosus= (Möbius, 1855) Diesing, 1861 _Synonymy._--_Chordodes pilosus_ Möbius, 1855 [Diesing, 1861.] _Natural host._--_Blaberus giganteus_, Venezuela (Möbius, 1855): From the insect's abdomen. =Gordius= sp.