24 Oribata 



short. Psstg. protuberant; Psstg. org. short, strongly clavate. Rost. hairs 

 long, 2 pairs of hairs between Rost. hair and Intlam. hair. Legs short, pair 

 4 not seen from above. Abd. with straight sides; post, margin rounded. 

 Dors, of Abd. arched, divided in middle by a strong transverse indented 

 line. Ant. margin of Abd. curved, with 2 or 3 folds near it; 2 long flexible 

 hairs on each autero-lateral angle and about 6 round post, margin; some 

 smaller hairs on Dors, of Abd. Im. L. ca. 420 |u. 



On lichens (Parmelia). England. 



45. O. rileyi Haller 1884 0. R., G. Haller in : Arch. Naturg., v. 50 I p. 223. 



Im. Dark brown, very pyriform, compressed anteriorly rounded poste- 

 riorly, granular, epiostracum loose and easily detachable. Lam. small. C. lam. 

 large, broad, truncated, almost horizontal, Trlam. a blade on edge. 

 Lam. hail' and Intlam. hair setiform, small. Psstg. org. rather short, clavate. 

 Abd. pyriform with crescentic indentation in middle of hind margin; 

 a small rounded projection lower in level seen in centre of crescent. Ptm. 

 reaching very far back, the 2 (one each side) joined anteriorly by a 

 long chitinous bridge. 2 rows of short serrated hairs on Dors, of Abd. 

 L. ca. 500 ju. 



Described from a single specimen. 

 America. 



O. afflnis Banks 1895 0. a., Banks in: Tr. Amer. ent. Soc., v.22 p. 6. 



im. Resembles 0. pratensis Banks, but Lam. longer, no Trlam. Ptm. much 

 smaller (half the size); Psstg. org. longer. Dors, of Abd. hairless. Ung. trid. L. 800 |u. 



America (Washington). 



O. arborea Banks 1895 0. a., Banks in: Tr. Amer. ent. Soc., v. 22 p. 7. 



Im. Yellow-brown, often with a white spot, on Dors, of Abd. near ant. margin, 

 moderately convex, highest posteriorly. Psstg. org. very short, clavate; Abd. smooth, 

 Dors, hairless; Ptm. as long in proximo-distal as in antero-posterior measurement, 

 tapering to a rounded tip. Ventr. surface smooth; post. Femur broad. Ung. trid. 

 L. 600 IUL 



On cedar and peach trees. New York State. 



O. calcarata C. L. Koch 1835 Oribates c., C. L. Koch, C. M. A., fasc. 2 t, 13 1| 

 non 1883 0. calcaratus, Berlese, A. M. S., fasc. 9 nr. 2 & Crypt. II p. 65 (v. 0. berlesei) \ 

 non 1885 0. c., Canestrini, Prosp. Acarof., v. 1 p. 17. 



Im. Small, very black, polished. Cephth. with numerous projections. Lam. 

 broad, white, far apart. Psstg. org. long clavate, reaching tip of Rost. Intlam. hair 

 long, thick, white. A pair of thick spatulate hairs or spines at distal end of Genual 1. 2, 

 and 1 at end of Tibiae 3, 4. Abd. globular, truncated anteriorly, 4 minute hairs on 

 post, margin, no others on Abd. 



Species probably good but imperfectly described and figured. 

 In woods. Germany, Sweden. 



O. depressa Banks 1895 0. d., Banks in: Tr. Amer. ent. Soc., v.22 p. 6. 



Im. Red-brown. Psstg. org. moderate length, capitate. Abd. smooth, depressed 

 plainly longer than broad. Ptm. large, long, projecting in front of Abd., not sinuated 

 at distal margin. Dors, of Abd. hairless. Ung. trid. L. 450 \n. 



Xew York State. 



