246 (du. a. c, oudemans) list of dutch acari. 



Wassermilben + Sumpfmilben Koch, 1842, in his Uebers. des 

 Ar. Syst. p. 7, 35. 



Hydrarachnidia , Van deb Hoeven, 1849, in his Handb. d. 

 Dierk. p. 674. 



Hydrachnidae Gerstaecker, 1863, in his Handb. Zool. II. 

 p. 341, Neuman, 1869, in his Bidr. tili Kann. Sver. Hydr. ; 

 Karting in his Grondb. d. Dierk. III. p. 349; Gervais et Van 

 Beneden in their Zool. Med. II. p. 455, Murray, Kramer, Glaus, 

 Hayek , Brass , and others. 



Hi/drarachnea , Giebel, 1863, in his Naturg. d. Thierrh. IV. 

 p. 391. 



Hi/di-arachnidae Burgersdijk, 1873, in his: De Dieren, III, 

 p. 318, and 



Hydrachioidae Thorell, 1871, 1872, 1875, in Oefv. Kong. 

 Vet. Akad. Förh. and 1873 in his Rem. Synon. Spid. 



The group of the tìydrachnellae is divided into two natural 

 groups viz. in those of the Limnocharidae Grube and the Hydrach- 

 nidae Lebert. 



2. Grube, 1859, in Arch. f. Nat. Liv-. Ehst-, und Kurl. (2) I. 

 p. 434 and 466 created the name of Limnocharidae. The group 

 itself was already founded by Koch in 1842, but he called it 

 « Sumpfmilben » in his Uebers. d. Arachn. Syst. III. p. 35. — The 

 name of Limnocharidae is also used by Mégnin , 1876 in the 

 Journ. Anat. Phys. XII, p. 293, and by Kramer, 1877,1878, 

 Haller, 1880, Glaus, 1880, Canestrini, 1881, etc. 



Limnocharoidae is written by Neuman in Oefv. Kong. Vet, Ak. 

 Förh. 1875 p. 104. 



Hitherto I did not met with Limnocharidae in our country. 



3. Hydrachnidae Ledert. — Lebert uses the term « Hy- 

 drachnides » (French) and Hydrachniden (German) in Bull. Soc. 

 Vaud. Sc. Nat. XIII. p. 91, 1874 and in Sitz. Math. Nat. Gl. 

 Kais. Akad. Wiss. Wien. LXIX. L p. 646, 1874, in the sense of 

 Hydrachnellae without the Limnocharidae. We may safely admit 

 that Lebert would have written Hydrachnidae if he was asked to 

 latinise his French and German terminal syllable. Neuman writes 



