2A. 



Subfamily CEPHALOBIINAE FilipjeVj 193U 

 (Key to the genera) 



1. Head bearing six setae, .... = ..,„ ^ . « Butlerivis Goodey, 1929 

 Head without setae 2 



2. Stoma with massive tooth in basal part, opposing denticles present or 

 absent o 3 



Stoma without massive tooth but with large dorsal tooth-like "glot- 

 toid organ" Cephalobiim Cobb, 1920 



3. Tooth opposed by denticles Odontopharynx de Man, 1912 



Tooth not opposed by denticles Acrostichus Rahm, 1928 



Others: (?) Loxolaimus Rahm, 1928 



Subfamily PRISTONCHINAE Chitwood, 1950 

 (Key to the genera modified from Allen, 1950) 



1. Stoma broad, shallow and unarmed Lycolaimus Rahm, 1928 



Stoma broad, armed at base 2 



2. Esophagus with a constriction behind the median bulb 



Paradiplogaster Stekhoven & Teunissen, 1938 



Esophagus without constriction, stoma amed at base with 3 curved 

 teeth Pristionchus Kreis, 1932 



Others: (?) Peronilaijtius f?ahra, 1928 which contains a single species 

 P. saccai Rahm, 1928. 



Subfamily DIPLOGASTEF;lNAE Micoletzky, 1922 

 (Key to the genera modified from Allen, 1950) 



Tooth well fonvard in stoma, thumb-like, a large fixed denticle a- 

 rising from the pharyngeal wall at right of tooth 



Mononchoides ftahan, 1928 



Dorsal tooth near base of pharynx, may be opposed by tooth on ventral 

 side Diplogaster Schulze, 1857 



