116. 



16. Font! of tail repular interniedius Cobb, 18'^3 



Form of tail somewhat irregular tenuicaudatus Stefannki 



17. Tooth midway, amphids a little behind lips major Cobb, 1893 



Tooth and anphids at the base of the lips . . . gerlachei de tian, I90U 



18. Esophagus 15 per cent fovea rum (Dujardin) Bastiau, I866 



Escpha'-:us 22 per cent I9 



19. Buccal cavity about twice as long as head width 20 



Buccal cavity only half as long as width of head 21 



20. Spinneret armed with 2 very small setae .... megalaimus Cobb, 191? 

 Spinneret not armed with setae macrostoma Bastian, 1866 



21. Labial papillae setose obtusus Cobb, 191? 



Labial papillae, at least the outer, not setose . . ~. '. ', T .... 22 



22. Pharynx I/3 as wide as head; body 1.5 mm. long 



titnbridp-ensis Bastian, I866 



Pharynx at least 1/3 as wide as head, body 2 to 3 nmi 23 



23. Buccal cavity about twice as long as wide; tooth acute 



truncatus Bastian, 1866 



Buccal cavity about 3 times as long as wide 2I4 



2i|. Inner labial papillae large; tail sub-conoid . . .dadayi Kicol., I90U 

 Inner labial papillae normal; tail finally cylindric 

 ..... longicaudatus Cobb, 1893 



25. Arrangement of the denticles irregular 26 



Arrangement of the denticles orderly 28 



26. Spinneret absent; tooth behind midway recessus Cobb, 1917 



Spinnei-et present; tooth in front of midway 27 



27. Denticles about 20; pharynx half width of head. . dentatus Cobb, 1917 

 Denticles about 50; pharynx I/3 width of head . . decurrens Cobb, 1917 



28. Denticles along a ventral, longitudinal pharyngeal rib 29 



Denticles in transverse rows 33 



29. Eggs punctate or echinulate pixnctatus Cobb, I9I7 



Eggs not punctate or echinulate 30 



30. Length 2.5 to 3.5 mm 3I 



Length U mm. or more spectabilis Ditl., 1911 



31. Denticles inward pointing jon^icollis Cobb, 1917 



Denticles forward pointing * 32 



32. Pharynx twice as long as wide longus Thome, 1929 



Pharynx 1,5 times as lon^ as wide . .muscoriim (Dujsr-iin) Bastian, I866 



