Ui^. 



15. Female rectum shorter than anal body diameter 



... 9 ,,.,... . suoerbus (de nan, '1830) Doodoy, 19^1 



Fe: -ale rectvun equal or longer than anal body diametsr 16 



16. Inner cuticle corrugated j a= 38; cardia obscure 



.......o..... . cocophilus Loos, 19^9 



Inner cuticle not corrugatedj a= 28 | discoid formation between conical 

 cardia and esophagus. .»..c...o...,. parvus Altherr, 195U 



17. Vulva anterior to middle, e'^;js shorter than body width 

 ......... de clinat oa cul eatus (Kreis, 192U) Th. & Swang., 1936 



Vulva posterior to middle, eggs longer than body width 

 o..... Yorax Th. & Swang., 1936 



Genus Labronema , Thorne, 1939 

 (Key to the species modified from Thome, 1939) 



1. Length 1.5 mni or less 2 



Length well over 2,0 mm .......c..... 3 



2. Vulva near 70^5 anterior ovary extending almost to base of esophagus 



ruttneri (Schneider, 1937) Thome, 1939 



Vulva near 60%; anterior ovary extending half-x^ay to base of 

 esophagus .......... octodurensis Altherr, 1950 



3. Lip region almost continuous with neck contour 



....... pacificum (Cobb, I906) Thorne, 1939 



Lip region set off by distinct depression or constriction 3 



U. Aperture of spear occupying about one-half its length 5 



Aperture of spear occupying one-third or less of its length .... 6 



5. Lip region broadly discoid. ,....,..,,.. ferox Thome, 1939 

 Lip region more angular . . . varicaudatum (Thorne, 1929) Thome, 1939 



6. Lip region narrowed ... ....... 7 



Lip region somewhat expanded , 8 



7» Vulva bordered by minute membranes. . , . . . . f imbriatum Thome, 1939 

 Vulva not bordered by membranes uniforme Thorne, 1939 



8, Lip region almost half as high as wide 



. . czemowitzensis (Micol,, 1922) Thome, 1939 



Lip region nearer one-fourth as high as wide. , , 9 



9. Supplements lU - 16; length 2,U mm 



alticolum (Menzel, 19lh-) Thorne, 1939 



Supplements 2I45 length 3»3 nim 



hyalinum (Th, & Swang., 1936) Thome, 1939 



