Oribata 11 



(Lam. deeply excavated anteriorly so as to 

 end in 2 long free points of about equal 

 length 24. 



' Lam. truncated anteriorly 27. 

 Dors, of Abd. with a row of hairs near 



margin; terrestrial 25. 



I Dors, of Abd. hairless ; aquatic. - L. 550 \JL 21. O. aquatica p. 18 



Ptm. reticulate with a dentate ant. margin. 



- L. 600 M. 26. O. quadridentata .... p. 19 



Ptm. not reticulate nor with dentate margin 26. 

 / Psstg. org. clavate; hairs round Dors, of 



Abd. about 12. L. 580 JLI 25. O. quadricornuta . . . . p. 19 



26 ' Psstg. org.. setiform. strongly curved toward 



! 



median line ; hairs round Dors, of Abd. 



about 18. L. 450 |u 22. O. berlesei p. 18 



( Outer lat. edge of Lam. strongly and 



27 | irregularly dentate. L. 390 |u . . . 20. O. americana p. 18 



1 Outer lat. edge of Lam. plain. L. 210 n 27. O. tecta p. 20 



{Dors, of Abd. with transverse furrows. 

 L. 420 in 23. O. languida p. 18 

 Dors, of Ab. without transverse furrows. 

 L. 650 |LI 24. O. ovalis p. 19 



I Ptm. projecting forward nearly to tip of Rost. 30. 



29 < Ptm. truncated anteriorly not projecting 



beyond ant. margin of Abd. 34. 

 j Projection of Ptm. pointed anteriorly. - 



30 | L. 520 n 35. O. intermedia p. 21 



I Projection of Ptm. rounded anteriorly 31. 



j Abd. with 2 large chitinous points projecting 



31 < from centre of hind margin L. 650 ju 37. O. mucronata p. 22 



\ Abd. without such points 32. 



| Psstg. org. short clavate. L. 600 |u . . 29. O. alata p. 20 



32 < Psstg. org. with long slender recurved 



peduncle and fusiform head 33. 



{Dors, of Abd. with fine longitudinal winkles. 

 - L. 850 |u . . 39. O. rugifrons p. 22 

 Dors, of Abd. plain. L. 700 n .... 33. O. dorsalis p. 21 



f Dors, of Abd. hairless 35. 



\ Dors, of Abd. bearing conspicuous hairs 39. 



{Abd. and Cephth. plainly divided 36. 

 No demarcation between Abd. and Cephth. 

 - L. 900 |n 31. O. centro-americana . . ]t. 21 



/ Lam. hair strongly serrated and nearly 

 twice as long as Cephth. Intlam. hair 



36 ' sharply recurved. L. 430 |u . . . . 28. O. agilis p. 20 



I Lam. hair, simple, setiform; Intlam. hair 

 I not recurved 37. 



{Lam. much shorter than Rost. 38. 

 Lam. nearly as long as Rost.; Psstg. org. 

 fusiform, horizontal, directed forward. 

 - L. 320 n 30. O. avenifera p. 20 



1 Psstg. org. short, clavate. pointed anteriorly, 

 directed forward. L. 350 |u . . . . 32. O. cuspidata P- 21 

 Psstg. org. long, recurved, with slender 

 peduncle and fusiform head. L. 600 |u 36. O. lucasi p. 22 



