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Genus Tylenchus Bat^tian, l86i> 

 (Key to the species ad;Apted l.iy Allen, 1950 iro:ii iilipjev 

 f; Stekhoven, 19la) 



1, Tail length 5 or more times nnal di-jneter 2 



Tail length not exceeding U-l/2 times anal body diameter 11 



2, Body width at least 2.5 per cent oi bo(iy length 3 



Body width less tlian 2 per cent ox body lengtli 10 



3, Length usually exceeding 0.5 mm h 



Length usually less than 0.5 mm 9 



\x» Spear at least l/7 oi osophageal length 5 



Spear less than l/7 of osophageal length. .8 



5« Tail length 5 times anal body diai.ieter uniTormis Cobbj 1693 



Tail length 7 times anal body diameter davainei Bastian, 1865 



6, Tail length not exceeding 7 times anal body diameter. 6 



Tail length exceeding 10 times anal body diameter 7 



7. Tail length 11 times anal body diameter .... ema rginatus Cobb, 1893 

 Tail length 12 times anal body diameter .... agricola de Man, 1881; 



8, L(ingitudinal striations present co status de Han, 1921 



Longitudinal striations absent filiformis ButsclHi, 1873 



9. Cuticle coarsely annulated. . . bryophll us Steiner, 19 lU 



Cuticle finely annulated minutus Cobb, l893 



10. Tail length l8 times anal body diameter .... leptosoma de Man, 1880 

 Tail length 5 times anal body diameter foliicola Zimra., 1902 



11. Adults 1.0 iiira, or more in length. "12 



Adults less tlian 1.0 nm. in length ...,13 



12. ^ = about 30 askenasyi Butschli, l873 



a. = about 50 to 60 gracilioides Micol., 1925 



13» a = 30 or less lU 



a = 35 or more. brevicaud a Micol., 1925 



lii. Spear equal to l/9 - l/l2 of esophageal length. terricola Bastian, 1865 

 Spear equal to l/Ii - l/5 of esophahreal length l5 



15» Spear 2-1/2 times as long as vddth of liead at base.farTrdcki Ralmi, 1921; 



Spear 1-1/2 times as long as iiridth of head at base.""; . . 



weidenbaclii Rahm, 192h 



