13! 



16. Tail distinctly di(?itate (55. 5u long), V = 39. U^ 



mamjllatnra Stekhoven & Teunissen, 193^^ 



Tail not digitate, subconoid (32u long), V = 33. i4 - 3U.2!i^ 

 , . . . . k rugi Lordello, 1955 



18. Four pairs of caudal papillae present . , . . campingnse Lordello, lyjl 

 More than k pairs of caudal papillae present. 18 



18. Combined length of spear and spear extension shorter (I23.iiu) 



,,,,...,.....,.... italiae ^leyl5 1953 



Combined length of spear and spear extension longer ( 1U2. 0-158, Oi) ) • 19 



19. Six pairs of cavdal papillae present; spear apparently consisting of 



two parts ..... elongatum Stekhoven & Teunissen, 1936 



Seven pairs of caudal papillae present; spear consisting of only one 



20. Tail long (77. 0-102. Ou); V = 29.8-31.6;^; with a cuticular triangular- 

 shaped structure in the anterior slender part of the oesophagus 



insigne Loos, 19U9 



Tail short (U8.0-57.0u)| V = 39.0-Ii2.0^j without such a triangular- 

 shaped structure in the anterior portion of the oesophagus 



. . , aratense Loos, 19U9 



» B 9 



Genus Xiphinema Cobb, 1913 

 (Key to the species after Luc, 1958) 



1. One ovary ...,...., 2 



Two ovaries (the anterior one reduced and obscure in X. krugi ) 5 



2. Tail long (more than four times body width at anus) 



. chambersi Thorne, 1939 



Tail short (less than four times body width at anus ) . . . ..... 3 



3. Tail hemispherical. ..... ensiculiferum (Cobb, 1893) Thorne, 1939 



Tail mamillate (digitate) ...............,.,,'.. i 



U. Two pairs of caudal papillae. brasiliense Lordello, 1951 



Three pairs of caudal papillae. ....... radicicola Goodey, 1936 



5. Tail long (more than four times body width at anus) 6 



Tail short (less than four times body width at anus). ...,.,. 7 



6. V = 29-32^5 seven pairs of caudal papillae insigne Loos, 19U9 



V = li7^j three to five pairs of caudal papillae . . . hallei Luc, 1958 



7. Tail hemispherical or mamillate (digitate) 8 



Tail conical *. I3 



8. Tail hemispherical o 



Tail rrariiillate (digitate) 10 



