1905. | BRITISH MITES OF THE FAMILY OkIBATIDE. 565 
Fam. ORIBATID2. 
Subfam. ORIBATINA. 
Gen. OrrpBata Latreille. 
ORIBATA FURCATA, sp. nov. (Plate XIX. fig. 1.) 
Adult. Length 500 gw. Colour dark brown, nearly black. 
Surface polished. Lamelle, blades on edge with very long 
cylindrical cusps, the whole extremity of the cusp being occupied 
by the base of the long lamellar hair. Translamella an inverted V. 
Interlamellar hairs present. 
Pseudostigmatic organs long, sub-clavate, directed forwards and 
upwards. 
Pteromorphe small. Claws monodactyle. Genital and anal 
orifices moderately far apart, shaped like the keystone of an arch ; 
the anal considerably the larger. 
Nymph and larva unknown. 
Two specimens found in moss from Austwick Bog, Yorkshire, 
in May 1904. 
There is no danger of confusing this very distinct species with 
either of the other two known British monodactyle Oribatas, 
O. fusigera and O. parmellie. The first is very minute, while the 
second has hairs on the notogaster, and short clavate pseudo- 
stigmatic organs. 
ORIBATA OMISSA, Sp. nov. (Plate XIX. fig. 2.) 
Adult. Length 700 ». Colour dark brown. Surface highly 
polished and shining. Body distinctly broadest in the middle. 
Lamelle, blades on edge, with a long sharp-pointed cusp standing 
free, the lamellar hairs springing from the inner angle of the 
cusps. No translamella. Claws tridactyle. Not rare in moss, at 
Cambridge. 
Nymph and larva unknown. 
We think it likely that this species kas hitherto been overlooked 
on account of its resemblance to the common and extremely 
variable species O. lapidaria, and in spite of the different facies, due 
chiefly to its barrel-shaped body and polished surface (destitute of 
a light spot), there seemed to be few clear distinctive characters. 
The absence of any trace of a translamella, and the sharp-pointed 
cusps, are, however, good characteristics. Though occurring in 
the same neighbourhood their habitat is different, O. omissa being 
exclusively found in moss, nor have we met with any intermediate 
forms. 
ORIBATA RUBENS C, L. Koch. 
This very distinct species occurred in Sphagnum from heath-pools 
at Bournemouth in October 1905. It is about 500 y in length, 
chestnut-coloured, and with very long legs. It is now for the 
first time recorded as British. 
