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Transactions of the Society. 
than the other two, and bearing a regular series of short, fine, curved 
hairs directed outward. Thus the whole abdomen is bordered by three 
nearly parallel ridges or lamellae ; the extent to which one projects 
beyond the other varies in different specimens. From the inner of 
the three there are four small projecting ridges on each side of the 
body, the first two are annular, the outer side of the small ring being 
joined to the inner side of the outer ridge. In each of the two hinder 
projections the inner part of the ring is absent, leaving a semicircular 
ridge projecting inward from the principal ridge. 
Dorsal surface divided into two unequal parts by a straight 
trench running from the inner of the three parallel ridges on one side 
to the same ridge on the other side. The anterior of these parts is 
slightly raised along the median line, and has a more or less defined, 
nearly triangular median space bordered by a rough, irregular, broken 
ridge ; which anteriorly is little more than a series of small lumps or 
dots. Within this space, and much nearer the median line, are two 
other longitudinal ridges, still more irregular and broken, which 
approach each other in the middle, and then separate again in hour- 
glass fashion ; at the rear part of their course there is a shallow con- 
cavity between these last-named ridges. There are four or more 
rough chitinous lumps on the dorsum between the two sets of ridges. 
The posterior part of the body has its median portion divided into 
three slightly concave spaces by ridges which are in effect continua- 
tions of those on the anterior part, but far less broken or irregular. 
All the ridges bordering or in the median space on either part of the 
dorsum are provided with hairs similar to those on the inner of the 
three peripheral ridges ; except that along the transverse sulcation 
the hairs are spatulate, thick, and dirty white. The hinder portion 
of the dorsal surface, and part of the median space in the anterior 
portion, is coarsely and irregularly areolated (areolations from about 
• 015 mm. to about * 035 mm. in diameter), and the whole surface is 
rough and uneven. 
Ventral surface (fig. 2). — The camerostoma is triangular ; from its 
anterior point a short chitinous bar runs to the place where the two 
lamellae fuse above the rostrum ; from this point a pair of smaller and 
darker, but well-defined, lamellae run along the sides of the camero- 
stoma. The excavations for the reception of the legs are very deep 
and well-defined ; those for the fourth pair have narrow prolongations 
for the tarsi directed inward and backward. The femora, when in the 
excavations, lie in what may almost be called pockets; having a 
chitinous expansion below them. There are two curved, rough ridges 
near the inner side of the depressions for the fourth pair of legs, 
running from near the coxae of that pair to about the level of the anus. 
In my male specimen there are also one or two short irregular ridges 
behind the anus ; and there is an indication of areolation of that part 
of the ventral plate. The junction between the dorsal and ventral 
plates is not easy to detect. The epigynium (genital plate of the 
