16 Oribata 



Trlam. a narrow blade on edge, of even width almost throughout- 

 Psstg. large, open, projecting; Psstg. org. short, spatulate, slightly recurved; 

 Tectp. 1 with long projecting point, 2 rounded. Abd. generally nearly 

 round, but varies, arched, slightly truncated anteriorly. Ant. margin of Abd. 

 strongly sinuated. Dors, of Abd. hairless. -- Nph. very like that of 0. lapidaria, 

 except in color. Pinkish-brown or yellow-brown; much dotted and slightly 

 rough; pyriform or diamond-shaped. Cephth. short, constricted in middle. 

 Psstg. org. short, heads nearly globular. Intlam. hair, Rost. hairs and some 

 of the hairs on legs serrated; Dors, of Abd. with large, flask-shaped, 

 thickened, dotted patch with expulsory vesicles at sides as in 0. lapidaria 

 Nph. A large, curved, serrated hair on antero-lateral angle ; 2 rows of short 

 fine hairs on Dors, of Abd. and 2 pairs on post, margin. - - Im. L. ca. 650 |o. 



On oak-trees, etc. England, France, Germany, Italy, Sweden. 



14. O. pallidula C.L.Koch 1841 Zetes pallidulus, C.L.Koch, C.M.A., fuse. 31 

 t. 9 j ?1841 Z.fuscomaculatus, C.L.Koch, C. M. A., fasc. 31 1. 11 (Nph.) | 1844 Z. 

 latipes, C.L.Koch, C. M.A.. fasc. 38 1. 14 j 1886 Oribates I, Berlese, A.M. S.. fasc. 30 

 nr. 3 j ? 1855 Oribata femoralis, Xicolet in : Arch. Mus. Paris, v. 1 p. 433 t. 4 f. 4. 



Im. Red-brown or chestnut-brown. Lam. narrow blades widest poste- 

 riorly. No C. lam., Trlam. a mere line if visible. Psstg. org. short, clavate. 

 recurved. Intlam. hair very long, reaching tip of Rost. Abd. narrow, small 

 posteriorly. Ant. margin of Abd. convex forward in centre, concave laterally. 

 Ptm. narrow, but long. Dors, of Abd. hairless. Femur of leg 2 

 greatly enlarged at distal end. Berlese's drawing of Abd. is much 

 narrower posteriorly than Nicolet's. - - Im. L. 500 620 |u. 



In moss. France, Germany, Italy. 



15. O. piriformis Nic. 1855 0. p., Nicolet in: Arch. Mus. Paris, v. 7 p. 436 t. 5 

 f.3 | 1884 O.p., Michael, Brit, Crib., v. 1 p. 238 t. 6 f. 2, 10. 



It is often impossible to distinguish the Im. of this species from 

 0. orbicularis, but the Nph. is quite different. 0. piriformis is generally 

 narrower than 0. orbicularis and has outer corner of C. lam. pointed instead 

 of rounded. - - Nph. Rost. and legs dark brown, rather rough ; provertex 

 light yellow polished, behind this 2 rolls of leathery skin greenish-brown. 

 Cuticle of Abd. whitish but Dors, of Abd. almost entirely covered by a finely 

 punctured chitinous plate which is dark olive-green in fully grown Nph. 

 Rost. pointed. Cephth. behind Rost. in 3 divisions. Intlam. hair and Rost. 

 hairs not serrated. Abd. veiy square, with rounded corners, not much 

 arched; Dors, of Abd. hairless. - - Im. L. ca. 650 ILI. 



In moss. England, France. 



16. O. punctum C. L. Koch, Berl. 1838 Oribatesp., C.L.Koch. C.M.A.. fasc. 30 

 t. 22 [ 1877 0. p., Canestrini & Fanzago in : Atti 1st. Veneto. ser. 5 v. 4 p. 16 | 1885 0. p., 

 Canestrini, Prosp. Acarof., v.l p. 19 j 1886 O.p., Berlese. A. M. S., fasc. 30 nr. 2. 



Im. Dark smoky-brown, smooth. Lam. very short blades on edge, 

 much nearer together anteriorly than posteriorly. Trlam. a blade as wide as 

 Lam., which distinguishes this species from 0. avenifera. No Trlam. Psstg. 

 org. directed horizontally forward with short peduncle and fusiform 

 head. Abd. sub-hemispherical. Ptm. wide, not running far back. Femur 

 1 with blade. L. ca. 400 ju. 



Koch's species would not be distinguishable, Canestrini's contains erroneous 

 anatomy; the species really is denned by Berlese's figure and description. 

 In moss. Germany?, Italy, Sweden. 



