160. 



Subfamily LEPTON CHINA K Thorne, 1935 

 (Key to genera modified from Thorne, 1939) 



1. Esophageal bulb not set off by constriction . , 2 



Esoohageal bulb set off by constriction ...<>.......... 6 



2. Bulb length twice the neck diameter or more 



,..,,,.,,..., Dorylalmoides Th. & Swang,, I936 P.161 



Bulb length less than twice neck diameter 3 



3. Bulb lumen in two sections Tyleptus Thome, 1939 



(Contains a single species T. projectus Thorne, 1939) 

 Bulb lumen not divided into two sections U 



U. Spear extensions flanged Tylolaimophorus de Man, 1880 P.I6O 



Spear extensions rod-like 5 



5. Ovaries two Leptonchus Cobb, 1920 P. 161 



Ovary one Proleptonchus Lordello, 1955 



(Contains a single species, P. aestivus Lordello, 1955) 



6. Spear with additional stiffening piece 



Tylencholaimellus M.V. Cobb, 19l5 P.162 



Spear without additional stiffening piece .... Doryllium Cobb, 1920 P. 160 



Genus Tylolaimophorus de Man, I88O 

 (Key to the species) 



1, Prerectum extending into caudal cavityj length 0.8 mm 



typicus de Man, 1880 



Prerectum not extending into caudal cavity; length 0.37 - 0.)4.3 mm 

 rotundicauda Paesler, 1955 



Genus Doryllium Cobb, 1920 

 (Key to the species from Thome, 1939) 



1. Spear small, more tylenchus-like 



bryophilum (Imamura, 1931) Thome, 1939 



Spear dorylaimoid with well developed extensions 2 



2. Female tail cylindroid then hemispherical uni forme Cobb, 1920 



Female tail uniformly conoid to blunt terminus. . .orthum "Thome, 1939 



