73. 



22, Pody slender, (fe^iale a=)i5-70); mucron slender and loointed 23 



Body more or 1-^ss thick, (female a=?0-U7)j mucron short ...... 21; 



23. Snear stron,:;, with well develooed ^asal knobs 



helioohilus (de 1-ian, I88O) Goodoy, 1933 



Spear delicate, v;ithout basal knobs 



naticochensis (Steiner, 1920) Flliojev a Stekhoven, 19Ul 



2I4. Post-vnlvar uterine sac well develooed, extending at least 1/3 the 



vulva-anal distance 25 



Post-vuivar uterine sac poorly developed or absent 31 



25. Lip region expanded, forming a disk . . . . brachycoohalus Thorne, 1935 

 Lio region otherwise 26 



26. Lateral fields marked by 2 or 3 incisures 27 



Lateral fields marked by h incisures 29 



27. Lateral fields marked by 2 incisures ipidicola Ruhm, 1956 



Lateral fields marked by 3 incisures 28 



28. Tail 2 anal body diameters long; esopna^us short (b=9-lU) 



o sacchari Hooper, 1958 



Tail 3.5 anal body diameters long; esopha'^us longer (b=8-10) 

 composticola Franklin, 1957 



29. Tail uniformly conoid, mucron centrally situated; body length 680-900 



microns; spear 17 microns long blast ophthorus Franklin, 1952 



Tail dorsally convex-conoid, mucron located ventrally; body length 

 U5O-623 microns; spear 11 microns long 30 



30. Egg U times as lon-j as broad; tail relatively thick conoid, rather 



sharply arcuate parietinus (Bastian, 1865) Steiner, 1932 



Egg 2.6 times as long as broad; tail somewhat thinner, only slightly 

 arcuate saorophilus Franklin, 1957 



31. Post-vulvar uterine sac poorly developed, less than 1 body diameter 



in length .... dactylocercus Hooper, 1958 



Post-VTilvar uterine sac absent 32 



32. Body length more than 900 microns oxurus Paesler, 1957 



Body length less than 6OO microns 3 3 



33* Head wide, spear equal to or shorter than the width of the head; spear 

 swollen at its base; head with distinct papillae 



goeldi (steiner, 19lU) Filipjev & Stekhoven, I9UI 



Head narrow, spear much longer than head width; no cephalic papillae 

 visible 3h 



3U. Body short and slender (L=0.[|2mm; a=3Y-UU) ; lips swollen, head set off 

 from body ("button-like") . . minor (Cobb, 1893) Steiner & Buhrer, 1933 

 Body longer and stouter (L=0.5-0.55 nim; a=26-32); lips low, head 

 bluntly conical, not set off from body 

 chajfiaelocephalus (Steiner, 1926) Filipjev & Stekhoven, 19hl 



