136 Transactions of the Royal Microscopical Society. 
On the back, at the widest part, is a broad, transverse, depressed 
line ; in front of this is a space somewhat the shape of an inverted 
shield with scalloped edges, and behind the depression is a some- 
what similar space turned in an opposite direction. These spaces 
are slightly raised, and occupy almost the whole width of the 
back ; the skin within them and on the upper surface of the first 
joint of the palpi is closely and irregularly plicated or headed, 
giving it a soft appearance; the depressed transverse line, the 
narrow parts of the dorsal surface beyond the spaces, and the 
whole under surface of the body and first joint of the palpi are 
marked with fine waved striae like the Sarcoptidse. 
The legs are short for the genus, conical, with the coxae stout, 
all finely striated except the tarsi, the striae running round the 
leg. The foot has the brush on the divided claw (the size of the 
drawing will not show this). 
The first joints of the palpi are extremely large, and form 
almost square blocks, seeming to hinge near the inner anterior 
angle, the inner posterior angle being forced into the hollow of the 
side of the rostrum when the palpus is widely extended. The 
second joints are much smaller, and are almost elongated right- 
angled triangles with the points prolonged into strong curved falces 
and a step cut out of each hypothenuse (the inner) side. At this 
step the third joints are articulated ; they are very small, and almost 
spherical, and are separately movable, and each hears, firstly (count- 
ing from the outside), a long curved falx, longer, slighter, and more 
curved than that of the second joint, but pectinated on the inner 
edge for about two-thirds of its length ; secondly, a similar one not 
pectinated ; thirdly, a straight spine pectinated up to the point ; 
and fourthly, a recurved hair much shorter. This is the charac- 
teristic palpus of the genus, but varies a little in the different 
species being unusually massive in this one. 
The fan-shaped hairs above described, characteristic of the 
species, are placed as follows : a row of eight down each side of 
the back, a little within the edge, standing nearly perpendicularly ; 
four across the anal extremity (dorsal surface), and two larger ones 
lower in level, one on each side of the anus ; a very large one on 
each of the mammillary processes at the side above mentioned, 
curving downwards, and usually one on each coxa except the 
second, and two on each of the next three joints of each leg on 
the outer side standing free, but curving over towards the leg, 
and two on the first joint of each palpus ; these hairs are not 
all similar, indeed every pair of hairs varies from the others in 
shape, &c. ; but the same hair is alike in difierent individuals, 
the distribution on the leg seems to vary a little. An enlarged 
figure of one of the broader hairs (taken from the leg) is given in 
Plate VL, Fig, 3. There is a line of six or seven fine, short. 
