284 British Oribatidce : Notes on New and Critical Species. 
Yorkshire ; abundant in lichen and dead wood. Oudemans 
records it for Holland under the name of marginatus Mich. 
C. nepos sp. n. (Plate C, figs. 2, 10). 
Length about 700 / 1 . 
Texture similar that to of scymnus and marginatus, but 
the granulations are slightly coarser and more apt to run 
into lines. 
Cephalothorax with distinct median ridge, divided by 
furrows from the lamellae. At the posterior end of the 
furrows stand the thick white lamellar hairs. Behind is a 
transverse ridge bowed forward in the middle and reaching 
from one pseudostigma to the other. Between this ridge 
and the abdomen is a deep transverse furrow. Pseudo- 
stigmatic organs almost uniformly cylindrical, doubly curved. 
Dorsum with the outline of coriaceus and the surface of 
marginatus. It agrees with both in the ehaetotaxy of the 
disk, and differs from both in the postero-marginal hairs 
which are exactly like those of the disk. On each of the 
projecting shoulders there is a curved rigid sharp spine, and 
a small smooth boss in the middle of the fore margin. 
Fairly frequent in West Allendale, Northumberland, and 
in the Derwent Valley, Durham ; usually on dead wood. 
ORIBATULA Berlese. 
I am following the order of Michael ; otherwise this 
genus would have appeared next to Oribates of which it is 
practically a section with pteromorphae rudimentary (or, 
exceptionally, entirely absent). Indeed, I think the true 
place of Michael’s Oribates lucasii (non O. lucasii Nic., which 
is larger, with blunt-ended pseudostigmatic organs), is here ; 
for its pteromorphae are very small, and I have several 
specimens in which they are totally wanting. I propose 
the name of Oribatula michaelii for this nameless species. 
O. affinis sp. n. (Plate C, fig. 7). 
Length about 450 fi. 
A small pale species near akin to O. exilis. 
Lamellae somewhat similar to those of exilis, but not 
extended at the base in front as in that species, and the 
lamellar seta springs from the acute cusp. This seta is 
serrate, pretty strong, and projects almost horizontally 
beyond the rostrum which it passes by a third of its whole 
length. Pseudostigmatic organs recurved by an obtuse 
elbow near their base ; shaft slender, extremity spatulate 
obtuse, fusiform in profile. Interlamellar setae distant from 
the dorsal margin by about a fourth of the length of the 
lamella:, strong and nearly vertical. 
Abdomen rather short and rounded behind. The fore 
margin is nearly straight in the middle, and there is no alar 
Naturalist* 
