George: Lincolnshire Mites. 179 
channels, he can indulge his taste with the original and 
authentic brand of those delicacies. The coast sections of the 
glacial deposits are, or at least were last autumn, in a very 
favourable condition for observation. One noteworthy feature 
then visible was a basement layer of coarse rubble consisting of 
local rocks, chiefly Jurassic Sandstone, with a few fragments of 
Lias. In this deposit no foreign boulders have as yet been 
detected. 
a 
LINCOLNSHIRE MITES. 
RHYNCHOLOPHIDA— (continued). 
C. F. GEORGE, M.R.C.S. 
Kirton-in-Lindsey. 
ERYTHREUS appears to be a fairly common Lincolnshire mite, 
as I have found several specimens at different times. Mr. Soar 
has succeeded in making a very characteristic likeness of the 
creatures (fig. 7), as well as a capital, and almost diagramatic 
sketch of the palpi and mandibles (fig. 8). This genus differs 
from the preceeding ones in having the mandibles only retractile, 
and their lancet-like shape and barbed extremities are well 
shown in the figure. The palpi are seen to be of five joints ; 
the last and smallest joint is bag-shaped, and attached rather 
near to the base of the fourth, altogether the organ is very 
similar to that found characteristic of the Trombidide. The 
colour of the mite varies considerably ; sometimes it is rust 
coloured and at others a rather deep red, the hairs being con- 
siderably darker than the body of the mite. They are rather 
short, stout, and thickly pectinated. Those on the body are 
rather blunt at the free end and sometimes slightly curved, 
whilst those on the legs and palpi are sharply pointed. The 
eyes are simple, very convex, bright, like red sealing-wax, and 
give the mite a rather fierce appearance under the microscope; 
they are two in number, embedded in the skin, one on either 
side of the cephalothorax, and in the middle between them is a 
dorsal groove containing a chitinous rod, looped at either end, 
having two very fine, rather long curved hairs in each loop, 
best seen in a recently dissected mite. The legs are long, the 
tarsus of each leg compressed sideways, and that of the first 
pair larger than the others. The Epimera are in four groups, 
1907 May 1, 
