40 



Liacarus 



5. Gen. Liacarus Michael*) 



1842 Oribates (part.). C. L. Koch, TJbers. Arach., v. 3 p. 99 | 1855 Leiosoma 

 (non Stephens. Coleopt.. 1831!), Nicolet in: Arch. Mus. Paris, r. 7 p. 439 | 1884 L., 

 Michael, Brit. Orib.. t: 1 p. 273 | 1885 L., Canestrini. Prosp. Acarof., v. 1 p. 7 1896 L., 

 Berlese, A. M. S., Orypt. II p. 58 | 1892 Liosoma, Trouessart in: Bev. Sci. nat. Ouest. 

 0.2 p. 48*. 



Body smooth. Last 3 pairs of legs inserted under the body. Ung. ted. 

 in all known species. 



9 good and 1 doubtful species. 



Key to the good species. 

 | Abd. oval, elongated — 2. ' 

 | Abd. as broad as long — 6. 

 9 J A central mucro beetvven the ant. ends of the Lam. — 3. 

 1 No such mucro — 5. 



f Mucro short, scarcely if at all passing points of C. lam. — 4. 



| Mucro long, almost reaching tip of Host. — L. 1,25mm 



7. 



L. 



nitens . . . 



• P- 



41 



| Psstg. org. fusiform with a terminal hair. — L. 850 |U 



1. 



L. 



coracinus . . 



• P- 



40 



4 ' Psstg. org. with short peduncle and globular head 











I — L. 450 u 



9, 



T,, 



globifer . . . 



• P- 



41 



. Abd. with a suture each side forming a lat border. 













| Psstg. org. long and setiform — L. 880 u . . 



6. 



L. 



marginatum . 



• P- 



41 



1 Abd. without lat. border. Psstg. org. short and 













' clavate. — L. 650 u 



8 



T,, 



ovatus . ., . 



■ P 



42 



/ Abd. globular (hemispherical) — 7. 













4 



T, 



lativentris . . 



• P- 



41 



_ | Abd. with 4 long hairs on post, margin — L. 700 u 



5. 



L. 



longipilis . . 



• P 



41 



7' ° JT -O " l " =-jt 1 



) Abd. hairless — 8. 

 I Lam. far apart anteriorly connected by a slender 



| Trlam. Psstg. org. clavate. — L. 1 mm ... 9. L. palmieinctus . p. 42 



J Lam. joined anteriorly. Psstg. org. fusiform sessile. 



I — L. 1,02 mm 3. L. globosus . . . p. 41 



1. L. eoracinus (C.L.Koch) 1841 Oribates c, C.L.Koch, C. M. A., fasc. 31 

 t. 1 1885 Leiosoma c, Canestrini, Prosp. Acarof., v. 1 p. 21 j 1885 L. c, Berlese, A. M.S., 

 fasc. 20 nr. 3 | ?1841 Oribates fuscus, C.L.Koch, C. M. A., fasc. 31 t. 2 | ?1854 Oribates 

 politics, 0. L. Koch & Berendt, Die im Bernstein befindlichen organischen Reste. v. 1 II 

 p. 110 t. 17 f. 112 | 1855 Leiosoma similis, Nicolet in: Arch. Mus. Paris, v. 7 p. 442 t. 6 

 f. 2 1884 L. simile, Michael, Brit. Orib., v.l p. 276 1. 13 f. 1— 7. 



Im. Dark brown, polished, Host, with a small point on each side. 

 Cephth. much narrower than ant. margin of Abd. Dorso-vertex raised in 

 centre, raised part pointed anteriorly. Lam. blades slightly sinuate, their 

 ant. ends deeply indented, terminating in 2 curved points. Lam. hair spines 

 springing between the points and passing tip of Eost. Psstg. org. fusi- 

 form, sessile, terminated distally by a fine hair. Blades to femora 

 of all legs. Abd. a long ellipse truncated anteriorly, almost pointed poste- 

 riorly; Dors, of Abd. polished, hairless, much arched; anal coyers large, 

 square, almost reaching post, margin. — Nph. Almost colorless except tip 

 of Rost. and Tarsus, polished, oblong, Psstg. org. short fusiform. Dors, of 

 Abd. with a sparse marginal row of flexible hairs. — Im. L. ca. 850 n, 

 a large variety ca, 1.1 mm, according to Berlese 1,5 mm. 



Algeria, England. Prance. 



*) The name Leiosoma Nicolet is preoccupied. The name I have used is derived 

 from \eTo<; (smooth) and diKapl (acarus). A.D.Michael. 



