24 



Oribata 



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

 long, 2 parrs of hairs between Kost. hair and Intlam. hair. Legs short, pair 

 ■i 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, witb 2 or 3 folds near it; 2 long flexible 

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

 smaller hairs on Dors, of Abd. — Im. L. ca. 420 ju. 



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. hair 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 u. 



Described from a single specimen. 

 America. 



O. affinis 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 p.. 



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 anteroposterior measurement, 

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

 L. 600 [i. 



On cedar and peach trees. New York State. 



O. calearata C. L. Koch 1835 Oribates c, 0. L. Koch, C. M. A., fasc. 2 1. 13 || 

 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 |u. 



New York State. 



