Ih6. 



29. Spear one-third width of lip region pusillus Cobb, 1893 (s) 



Spear one-fifth width of lip ref^ion . .arvensis Th. & Swang,, 1936 (s) 



30. Spear ].ength much less than twice width of lip region ....... 31 



Spear length twice width of lip region or more 35 



31. Amphid aperture equal to width of spear . .marinus Duj., I81i5 (marine) 

 Amphid aperture half the head width 32 



32. Lip region rounded, not set off in any manner 



hofmanneri Menzel, 191h (s) 



Lip region truncate, set off by slight depression 33 



33 • Lip region one-third as high as wide. . . tenviicaudatus Bast., 1865 (s) 

 Lip region less than one-fourth as high as wide 3U 



3U. Supplements contiguous, 15 — l6 tenellus Th. & Swang., 1936 (s) 



Supplements spaced, 7 — 9 subtilis Th. & Swang., 1936 (s or a) 



35* Lips set off by a depression imamurae Th. & Swang., 1936 (s) 



Lips continuous with neck contour 36 



36. Length over 3.0 ram serpentinus Th, 1?-. Swang., 1936 (s or a) 



Length under 2.0 ram filicaudatus Daday, 1905 (s) 



37. Female tails attenuated 38 



Female tails conoid-cylindroid or spicate 62 



38. Spear length two or more times the width of lip region .39 



Spear length distinctly less than twice width of lip region . . . . 5l 



39. Length under 2.0 mm. .... chekiangensis W! & Hoeppli, 1929 (a & s) 

 Length over 2.0 mm UO 



UO. Female tail length about equal to anal body diameter 



profundi s Cobb, 190li (a) 



Female tail length three or more times anal body diameter hi 



Ul, Spear one-half as wide as lip region, .novae zealandiae Cobb, 190i; (a) 

 Spear distinctly less than one-half width of lip region k2 



Ii2. Cuticle heavily striated annulatus Daday 



Cuticle finely striated k3 



h3. Esophagus narrow throughout, tapering gradually, posterior portion 



less than half the neck width Uh 



Esophagus with a distinct expansion i;5 



lUi. Body width less than 3.0^ selangorensis de Man, 1929 (a or s) 



Body width over 3.5^ unipapillatus Daday, 1905 (s or a) 



