lie. 



51. Leii'bh 2 to U rii;i. teeth K-cp'al Lridf::atabiis de Tian, 1876 



Length 5 to 6 mm. teeth sub-basal ^2 



52. Submedian teeth equaling the dorsal .... f^racilicandatus Cobb, 191? 

 Submedian teeth smaller than the dorsal .... dolichurus Dibl., IS'll 



53* Ovary single 5U 



Ovary double 5>'8 



5U. Tail di:--?;itate; 3 subeoual vestif^al teeth di^iturus Cobb, l'')93 



Tail not digitate; 1 dorsal tooth , $5 



55. Tail setaceous trichurus Cobb, 1917 



Tail slender, but not setaecous 56 



56. Pharynx as long as wide bathybins Micoletzky, 1?13 



Pharynx about 2 times as long as wide 57 



57. Amphid simple; buccal vjall thin, transversely striated 



gymnolaimus Cobb, 1893 



Amphid duplex} buccal wall thick, not striated. . consimilis Cobb, 191? 



58. Length It to 7 mm.; 3 teeth 59 



Length 1 to I4 mm.; 1 tooth, sometimes denticles 61 



59. Spinneret present; lips plain . . . o . , , 60 



Spinneret absent; lips striated lengthwise. .... . regius Cobb, 1917 



60. Length U mm.5 the 3 teeth subequal. ......... rap ax Cobb, 1917 



Length 6 to 7 mm.; submedian teeth smaller rex Cobb, 190U 



61. Anus at about 86 per cent 62 



Anus at about ^\x per cent .,..,<, 6U 



62. Lips not set off by constriction; onchi imequal or one, ...... 63 



Lips set off by a deep constriction; onchi three, equal 



fascoatis Cobb, 1917 



63. Onchus with small companions; head rounded, . . bathybius Micol., 1913 

 Onchus one only; head truncate. ,...,,,... similis Cobb, 1893 



6ii. Dorsal tooth small, others basal, minute studeri Steiner, I9IU 



Dorsal tooth moderate, distinct .,....,...,.,,.... 65 



S^, Buccal cavity as wide as long, main tooth basal , 66 



Buccal cavity longer than wide. . , .... 67 



66. Spinneret present .......... brachylaimu s Cobb, 1917 



Spinneret absent. .... ,..,..,, acutus Cobb, 1917 



67. Length about 2.3 mm,; males with 10-12 supplements 



, ampbi.?:onicus Thome, 1921; 



Length 2,5 to 3.5 irmi.; males with 20 suppl, , . zschokkei Menzel, 1913 



