153. 



137. Esophagus enlarged in posterior half. . . . superbus de Man 

 Esophagus enlarged in posterior two-thirds 

 sublabiatus Th. & Swang., 1936 (s) 



138. Spear length about twice width of lip region 



tenuidens Th, & Swang., 1936 (s) 



Spear length about equal to width of lip region 139 



139. Esophagus about 12.0^ accentuatus Th. & Swang., 1936 (s) 



Esophagus about 20.0^—28.0^ ll|0 



lUO. Spear aperture occupying three-fourths the spear length 



simplex Th. & Swang., 1936 (s) 



Spear aperture occupying about one-half the spear length .... liil 



lUl. Terminus subacute Ili2 



Terminus acute 1[|3 



IU2. Neck subcylindroid anteriorly .... capitatus Th. & Swang,, 1936 (s) 

 Neck more conoid anteriorly efficiens Th, & Swsing., 193 6 (s) 



li;3. Lip region set off by depression . . . acutus Th. & Swang., 1936 (s) 

 Lip region set off by constriction lliU 



Ikh* Esophagus 18.0;^ of total length .... cinctus Th. & Swang., 1936 (s) 

 Esophagus 23.0^—25.0^ of total length 

 diadematus Th. & Swang., 1936 (s) 



1U5. Ovary single H^S 



Ovaries two ll^Q 



II46. Spear length about equal to lip region width 



opisthodelphus Th. & Swang., 1936 (s) 



Spear length about four times lip region width Ikl 



Ihl. Body width 1.8^ longidens Th. & Swang., 1936 (s) 



Body width 2,8^ silvestris de Man, 1912 (s) 



11+8, Length 5.0—7.0 mm 11^9 



Length ii,0 mm. and under 1^0 



1149. Esophagus about 20.0^ of body length. . robustus de Man, I876 (s or a) 

 Esophagus about 13.0^ of body length. . . . bathybius Daday, I906 (a) 



150. Lip region broadly expanded corrii Liebermann, 1928 (a) 



Lip region not broadly expanded l5l 



151. Tails cylindrical, blunt, more than twice anal body diameter 



• • steatopygous Th. & Swang., 1936 (s or a) 



Tails bluntly convex-conoid to hemispherical ; . . . . 1^2 



152. Spear length two to four times width of lip region 153 



Spear length less than twice width of lip region 156 



