^n. 



Genus Chitinotylenchus Micoletzky, 1922 



Genotype is C. paragracilis (Micol., 1922) Filipjev, 1936 and. is in- 

 adequately described. The only other species is C. annul atus 

 (Cassidy, 1930) Filipjev, 1936. 



Genus Halenchus Cobb, 1933 

 (Rey to the species) 



Stylet 1/8 - 1/9 of total esophageal length; postanal parts of the 

 caudal alae less than 1/U tail length 



mediterraneus (Micoletzky, 1922) Cobb, 1933 



Stylet 1/13 - 1A5 of total esophageal length; postanal parts of the 



caudal alae more than 1/U tail length 



fucicola (de Man & Barton in de Man, 1892) Cobb, 1933 



Species inquirenda: 



H. mexicanus Chitwood, 1901 



Genus Psaudhalenchus Tarjan, 1958 

 (Key to the species ) 



Four lines in lateral field minutus Tarjan, 1958 



Six lines in lateral field anchilisposomus Tarjan, 1958 



Genus Trophurus Loof , 1956 

 (Key to the species) 



1. Length greater than 1 mm.; stylet 19-21u; cuticle on tail thickened 



but not swollen imperiolis Loof, 1956 



Length less than 0.8 mm; stylet l[t-l6u; cuticle on tail thickened and 

 also swollen 2 



2. Terminal esophageal bulb constricted in or behind the middle 



sculptus Loof, 1956 



Terminal esophageal biilb not constricted in or behind the middle 

 minnesotensis (Caveness, 1958) Caveness,1959 



syn: Clavaurotylenchus minnesotensis Caveness, 1958 



