ni. 



33, Ovary sitigle 3^1 



Ovarii^s double 3^ 



3k' Anterior ovary present, posterior absent index Cobb, l^O? 



Posterior ovary present, anterior absent r eversiis Cobb, 1917 



35. Dorsal tooth somewhat digitate; small 36 



Dorsal tooth not digitate; massive 33 



36. Spinneret terminal obtuGicaudatiis Daday, l^^Ol 



Spinneret slip;htly dorsal 37 



37. Caudal glands tandem parabrc'chynrus Thome, 192U 



Caudal glands grouped not tandem brachyiiris Butschli, 1873 



38. Head roimded, denticles in about 12 rows. . . denticulatus Cobb, 1917 

 Head tr\incate, denticles in 2 to 6 rows 39 



39 • Kows of denticles 2 sparsus Cobb, 1917 



Rows of denticles I4 to 6 UO 



UO . Denticles about U rows, spinneret small micrurus Cobb, 1917 



Denticles about 6 rows, spinneret lareer hi 



Ul. Tail bent ventrally near middle U2 



Tail arcuate or nearly straight k3 



It2. Caudal setae none, tail conoid incurvus Cobb, 1917 



Caudal setae 3 oairs, tail not conoid sigmaturus Cobb, 1917 



H3. Width of adults 2.3 per cent sub tenuis Cobb, 1917 



VJidth of adults 2.7 per cent or more l\h 



Uh- Spinneret absent subsimilis Cobb, 1917 



Spinneret present U5 



h:^. Spinneret opening slightly dorsal , U6 



Spinneret opening terminal U7 



I46. Eggs thick shelled obliquus Cobb, 1917 



Eggs thin shelled brericaudatus Cobb, 1917 



hi > Aquatic species lacustris Cobb, 191$ 



polonicus Stefanski, 1915 



Species not aquatic ..... US 



I4.8. Length over 1,5 mm ' . montanus Thome, 192U 



Length under 1.5 nim U9 



I49. Width over 3 per cent minor Cobb, 1393 



VJidth less than 3 per cent japonicus Cobb, 1917 



50, Teeth retrorse, small, basal ' 5l 



Teetii not retrose, small or p inute 53 



