122 
Miscellaneous . 
divided into a very great number of narrow transverse ridges by 
very fine grooves of a pale yellow colour. Down the mid-dorsal 
line runs a narrow dark stripe with a very fine white, or almost 
white, line running down the middle of it as in P. LeucJcartii. 
The general ground-colour is dark indigo-blue, often almost 
black, and this is checkered by more or less regularly arranged 
patches of pale dull orange or yellow. The typical arrangement 
of these patches appears to be as follows : — There is a squarish 
patch just over the base of each leg, more distinct than any of 
the others. Between the legs of each pair, in the mid-dorsal line, 
is a similar patch, interrupted by the median longitudinal stripe 
already mentioned, and separated from the patch over the leg on 
either side by a space of about the same width as itself. Thus 
there is a transverse row of three patches between the legs of each 
pair, and with these rows alternate other rows of only two patches 
each, in such a manner that a kind of chessboard pattern is pro- 
duced. Besides these patches there are on each side of the mid- 
dorsal line several longitudinal rows (the typical number appears to 
be four on each side) of more or less regularly arranged dull orange 
or yellow papillae. Sometimes the chessboard pattern is almost 
obliterated, leaving the longitudinal rows of papillae scattered over 
a nearly uniform dark background. The dorsal surface of the legs 
is dark indigo-blue, with two or three orange or yellow papillae. 
(6) Ventral Surface. — The ground-colour is pale yellowish. 
Over this are scattered a number of papillae, mostly of an indigo- 
blue colour, but some dull orange; the papillae are arranged in 
transverse rows, one row on each ridge of skin. The blue papillae 
are most numerous along an imaginary line joining the bases of 
the legs of each §ide. In the mid-ventral line, between the legs of 
each pair except the last, is an unusually pale area of skin, devoid 
of papillae, and sometimes presenting clear indications of a longi- 
tudinal slit-like aperture in its centre. I have described similar 
pale areas in P. Leuckartii , and cannot help thinking that they 
must have some important morphological significance. I hope to 
find out later on, when working out the anatomy, what this signi- 
cance may be. 
(c) The Antenna. — These are of a dark indigo-blue colour. 
I have attempted above to describe the characteristic pattern of 
the skin as deduced from five specimens, but it must be remembered 
that considerable individual variations are sure to occur, though 
probably, as in P. Leuckartii , all the variations will be found to be 
readily derivable from a typical pattern. This typical pattern is 
quite different in the two Australian species, as will be seen on 
comparing my descriptions of P. Leuckartii ( loc . cit.). 
Size. — The five specimens at present to hand are all very small, 
the largest being only about eleven millimetres in length (excluding 
the antennae), and one millimetre in greatest breadth, after pre- 
servation in spirits. 
Legs. — These are fourteen in number on each side of the body. 
They have three spinous pads on the ventral surface, as described 
