Pnrnr,. K:8 



17. Two-three pairs of caudal papillae 18 



At least four pairs of caudal papillae 20 



18. Two pairs of caudal papillae 19 



Three pairs of caudal papillae X. pra tense Loos, 19h9 



19. A = 50-55; ventral pores X. setariae n. sp. 



A = 70; without ventral pores X. parasetariae n. sp. 



20. Four pairs of caudal papillae X. c ampin ens e Lordello, 1951 



More than four pairs of caudal papillae 21 



21. V = UO-li?^; six pairs of caudal papillae 



X. elongatum Schuurmans Steckhoven & Teunissen, 1938 



V = ii3-ii7^ ^X. italie Meyl, 1953 



