3U. 



13. Length .30 mm. 5 spear 57 microns; annules 68-72 



..... o .... o sphaerocephalum Taylor, 1936 



Length ,50 mm.j spear 85 microns; annules W 



c ylindricum (Kir'ianova) Ftaski, 1952 



lU. Total body annules 115 or less; spear kQ microns or more 16 



Total body annules 1U2 or more; spear 25-Ul microns l5 



15. Total body annules 11+2-156, angular on posterior edge; vulva on 11- 



12th annule from terminus parvum Raski, 1952 



Total body annules 200, rounded edges; vulva on 7 -8th annule from 

 terminus zavadskii (Tulganov, 19l|l) Raski, 1958 



16. Total body annules approximately UO boettgeri Meyl, 195U 



Total body annules 60 or more .......... ~. ] '. '. T .... 17 



17. Total body annules 70 or more 19 



Total body annules 60-65 18 



18. First anniile irregular in outline or divided into h indefinite sub- 

 lateral lobes; anus located on 3rd or Iith annule from terminus 



infome (Micoletzky, 1922) Taylor, 1936 



Lips 6, large; anus on last annule very near terminus 

 anura (Kir'ianova, 19U8) Raski, 1958 



19. Spear length U8-67 microns 2k 



Spear length 70-86 microns 20 



20. Sublateral lobes absent 22 



Sublateral lobes present 21 



21. Head bluntly rounded; amphids narrow, slit-like . xenoplax Raski, 1952 

 Head sharply tapered; amphids small, rounded 

 quadricorne (Kir'ianova, 19U8) Raski, 1958 



22. Total body annules 73-8U; length .53-. 72 mm .23 



Total body annules 106-113; length .3U-.ii2 m.m . . . . teres Raski, 1952 



23. Length .53 mm.; total body annules 73 



........ congolense (Stekhoven and Teunissen, 1938) Raski, 1952 



Length .72 mm.j total body annules Qk 



beljaevae (Kir'ianova, 19)48) Raski, 1958 



2kj Sublateral lobes absent, or if present are not prominent and flattened 



anteriorly . 25 



Sublateral lobes prominent, flattened anteriorly presenting a trun- 

 cated head lobatum Raski, 1952 



25. First annule not well set off ' 26 



First annule well set off; cuticle of larvae provided with rows of 

 spines mutabile Taylor, 1936 



