Paras. 1:6 



19. Tall about 2 x anal body diameter, bearing less than 2^ annulns 



acutun n. sp. 



Tail about 3 x anal body diameter, bearing more than 2^ annules 



capitatua n. sp. 



20. Annules extending around, terminus of tail 21 



Annules not extending around terminus of tail 25 



21. Lip region set off by constriction or depression leptus n. sp. 



Lip region not set off by constriction or depression 22 



22. Lip sclerotization well developed, conspicuous — macrurus (Goodey) 

 Lip sclerotization faint, inconspicuous 23 



23. Spear more than 23 y long obscurus n. sp. 



Spear less than 22 p long 2U 



2I;. Spear more than 15 yi long, tail less than 3 x anal body diameter* 



nothus n. sp. 



Spear not more than 1$ u long, tail more than 3 x anal body 

 diameter nanus n. sp. 



25. Lip region continuous with body contour 26 



Lip region set off by constriction or depression — 28 



26. Tail short, conoid, terminus pointed brachyc ephalus Litvinova 



Tail subcylindrical, bluntly rounded 27 



27. Spear less than 20 ji long brevidens n.sp. 



Spear more than 20 ji long af finis n. sp. 



28. Lip sclerotization heavy, conspicuous 29 



Lip sclerotization faint, inconspicuous 31 



