SOAR : WATER MITES OF EPPING FOREST. 
99 
Genus 4—THY AS, KOCH. 
T. venusta, Koch. 
A red mite, without swimming hairs. Cuckoo-pits, 1898- 
T. thoracata, Pier. 
This has a number of chitinous plates distributed over 
the dorsal surface. Loughton, 1910. 
Sub-Family—DIPLODONTINYE. 
Genus 5— DIPLODONTUS, DUGES. 
D. despiciens, Mull. 
Quite a common red mite, found in all parts of the Forest. 
Family 4— HYDRACHNIDJE. 
Sub-Family—H YDRA RA CHNINYE. 
Genus 6— HYDRARACHNIA , MULL. 
H. globosa, de Geer. 
Another red mite ; not very common. Snaresbrook 
and Wake Ponds, 1897. 
H. geographica, Mull. 
This is the largest of all the water mites known in the 
Britannic area. The gravid female sometin\es is as 
much as 8 mm. long. It is black and red in colour. 
It has been found in the Forest several times. Snares¬ 
brook, 1895. 
H. scutata, Pier. 
Snaresbrook, 1910. 
H. schneideri, Koen. 
Snaresbrook, 1896. 
Family 5 —HYGROBATIDJE. 
Sub-Fam. — HYGROBATINYE. 
Genus 7— HYGROBATES, KOCH. 
H. longipalpis, Herm. 
The type species of this genus. East London Water¬ 
works, 1908. 
Sub-Fam.—SPERCHON IN IE. 
Genus 8.—SPERCHON, KRAM. 
S. squamosus, Kram. 
Very rare. Oak Hill 1899. 
Sub-Fa m.—L EBER TUN YE. 
Genus g.—LEBERTIA , NEUM. 
L. porosa, Sig, Thar. 
East London Waterworks, 1908. 
