82 Phthiracarus. Genera dubia et species dubiae 



Im. Chestnut-brown semitransparent ; A b d. 1 o n g , r o u n d e d p o s t e r i o r 1 y. 

 hairless. Genital and anal covers broad for the genus. (Description 

 chiefly taken from Perty's figure in Claparede's plate). L. 1,1 mm. 



In decayed wood. Germany. 



5. P. longulus (C. L. Koch) 1841 Hoplophora longula, C. L. Koch, (.'. M. A., 

 fast-. 32 t. 17 | ?1874 H.arctata, Kiley in: Rep. Ins. Missouri, v. 6 p. 52 & in: Tr. Ac. 

 St. Louis, v. 3 p. 215 ?1895 Tritia glabrata, Banks in: Tr. Amer. ent. Soc., v. 22 p. 16. 



Im. Yellow-brown, polished. Psstg. org. short, very clavate, head 

 almost globular. Abd. very long-shaped, very narrow, thick from ventr. 

 to dors, surfaces, slightly truncated anteriorly, rounded posteriorly, numerous 

 long fine hairs on Dors, of Abd., the longest pair on the shoulders. L. 700 ju 

 (Kiley). 



Kiley says his species is the shape of a mussel probably a Phthiracarus neither 

 of first two authors describe Ung. 



In woods. Germany; at roots of vines America, supposed (probably in error) 

 to be feeding on Phylloxera and correctly on cotton-wood logs. 



6. P. nudus (Berl.) ? 1844 Hoplophora laevigata, C. L. Koch, C. M. A., fasc. 38 

 1. 16 1 1887 Tritia nuda, Berlese. A. M. S., fasc. 35 nr. 21. 



Im. Earthy to sooty brown. Almond-shaped, polished, pointed 

 posteriorly. Dors, surface hairless. Psstg. org. with short thin 

 peduncle and fusiform head. L. ca. 800 ju. 



In moss and dead wood. Italy. 



7. P. retaltecus (Stoll) 1891 Hoplophora retalteca, Stoll in: Biol. Centr.- 

 Amer., Arach. acar. p. 27 t. 15 f. 4. 



Im. Like P. nudus, but no Psstg. org. visible externally, and central 

 Ung. said to be thinner than the 2 outer. 

 Guatemala. 



P. glabratus (Say) 1821 Or ibata glabrata, Say in: J. Ac. Philad.. r. 2 p. 68, 

 Coll. Writ., -v. 2 p. 16. 



Im. Black, spheroidal, somewhat oval, polished. Psstg. org. apparently with 

 globular head on very short peduncle. 



Uncertain genera and species of Oribatidae. *) 



Acarus L., em. Latr. 1758 A. (part.), Linne, Syst. Nat., ed. 10 r. 1 p. 615 j 

 1795 A., Latreille in: Mag. enc.. v. 4 p. 19 (Typus: A. coleoptratus L.). 



Acarus coleoptratus L. 1758 A. c., Linne. Syst. Xat.. ed. 10 r. 1 p. 616 1761 

 A. c., Linne, Fauna Suec., ed. 2 nr. 1973 | 1795 A. c., Latreille in : Mag. enc.. v. 4 p. 19 

 (Typus generis Acarus L. !). 



Acarus piger Scop. 1763 A. p., Scopoli, Ent. Carniol., p. 392. 

 Probably a Hoploderma. 



Acai'us rupestris F. 1794 A. r., J. Ch. Fabricius, Ent. syst., r. 4 p. 433. 



*) The following genera and species have been rejected as being either immature 

 creatures, too imperfectly described for identification, not Oribatidae at all although 

 called so; or for some other reason. A. D. Michael. 



