12 



Oribata 



39 < 



40 



41 



42 < 



43 



44 



2 longitudinal rows of hook-shaped hairs on 

 Dors, of Abd. and a bordering row; 

 Psstg. org. with short peduncle and 

 almost globular head. — L. 440 |a . . 



4 longitudinal rows of ordinary hairs on Dors, 

 of Abd. and a bordering row, Psstg. org. 

 with long peduncle and recurved fusiform 

 head. — L. 450 |u 



Dors, of Abd. bearing hairs — 41. 



Dors, of Abd. hairless — 43. 



Ptm. joined anteriorly by a chitinous 

 bridge ; a crescentic indentation in 

 centre of post, margin, 0. lam. hori- 

 zontal, truncated. — L. 500 . . . . 



Ptm. not joined; no indentation of post, 

 margin; C. lam. vertical, pointed — 42. 



Dors, of Abd. with an irregular network 

 of ridges; hairs on Dors, of Abd. long, 

 stiff, serrated, on post, margin clavate. 

 — L. 500 n 



Dors, of Abd. smooth; hairs on the same 

 short and simple, on post, margin 

 setiform. — L. 420 \x 



Psstg. org. short sessile, fusiform, directed 

 horizontally forward. — L. 300 |u . . . 



Psstg. org. long, recurved — 44. 



Psstg. org. pectinated along distal part of 

 ant. (outer) edge. — L. 390 |u . . . . 



Psstg. org. not pectinated. — L. 600 |a . . 



34. O. halleri p. 21 



38. O. peloptoides p. 22 



45. O. rileyi p. 24 



42. O. mirabilis p. 23 



44. O. parmeliae 

 41. O. fusigera . 



43. O. monodaetyla 

 40. O. dentata . . . 



j). 23 

 p. 23 



p. 23 

 p. 23 



Div. I. Sp. 1—39. Ung. trid. 

 Subdiv. I a. Sp. 1—19. Having a Trlam. 



1. O. antarctica Michael 1895 0. a., Michael in: Mt. Mus. Hamburg, v. 12 

 p. 71 textf. 



Im. Very like 0. gracilis but not identical, smooth, not quite so slender 

 as 0. gracilis nor legs quite so long. Lam. blades, much wider anteriorly 

 than posteriorly. C. lam. very long, standing quite free. Rost. hairs, 

 Lam. hair and Intlam. hair serrated. Psstg. org. with very short 

 peduncle and small, almost globular head. Legs of medium length, femora 

 of legs 3 and 4 with blades. Ung. trid. Tectp. 1 with long free points. 

 Ant. margin of Abd. convex in centre concave at sides. A few very fine 

 hairs on Dors, of Abd. L. ca. 700 n. 



South Georgia (Antarctic Ocean). 



2. O. elypeata Mc. 1855 O. c, Mcolet in: Arch. Mus. Paris, v. 7 p. 437 t. 5 f. 7. 



Im. Black, highly polished, legs brown. Lam. blades on edge, slightly 

 undulated; C. lam. very long. Trlam. a mere line strongly concave 

 forward. Tectp. 1 forming long free point anteriorly, bearing a hair. 

 Psstg. org. setiform, long. Abd. hairless broadest in centre, narrowed ante- 

 riorly and posteriorly but much more suddenly posteriorly; hind margin 

 truncated and much narrower than ant. margin of Abd., which is sinuated, 

 convex forward in centre, concave posteriorly. Ung. trid. L. 1.13 mm. 



Under stones. Prance. 



