Broun.—On Pericoptus truncatus. 289 
these the intermediate is the most bulky, though the apical is actually 
longer than it, and tapers somewhat towards the extremity. The head, 
including the mandibles, clypeus, and epistome, is more or less irregularly 
rugose, its sculpture, however, becoming finer towards the base, where there 
is an obvious longitudinal groove. The second and three terminal segments 
are almost glabrous, the intervening ones being more or less studded with 
short spiniform bristles, here and there intermingled with rather long hair- 
like bristles ; these latter are also distributed over the surface of the other 
segments, the apex of the last, moreover, bears more and coarser spines than 
are to be seen elsewhere. The under-surface bears many bristles, but is 
devoid of spines. 
The maxillary palpi, including the basal articulation, are four-jointed, 
the joints are cylindrical, the terminal being the longest and slightly 
acuminate. The antenne are more than twice the length of the palpi, 
formed of four distinct articulations, the socket not being reckoned ; the 
true second joint is a good deal longer than the others, and, like the first, 
cylindrical, but obliquely cut away at the end; the third joint is so placed 
as to appear slightly forked, and is prolonged beyond the point of insertion 
of the apical joint, which, therefore, is quite furcate, and has two, more or 
less evident, indentations at each side. The clypeus is transversal, nearly 
truncate, and densely ciliated anteriorly. The eye is quite rudimentary, 
being represented by a small oval elevation close to the antennal orbit. 
The legs are rather long and robust, bent, coarsely hispid, and four-jointed, 
with an additional articulation terminating in a large, broad, horny claw: 
the second joint is short, and, doubtless, merges in the tibia of the perfect 
insect. The spiracles are situated at the sides of the second, fifth, sixth, 
seventh, eighth, ninth, tenth, eleventh, and twelfth segments. 
In my second and smaller example, the under-side is roughly carinated 
longitudinally, and the terminal joint of one antenna seems as if cleft to its 
base. On examining the joint carefully, I notice that the inner side of one 
part is concave, and, consequently, adapted to receive the other. This 
peculiarity of structure, most likely accidentally exposed to view, indicates 
the presence of a rudimentary lamellated club, normally concealed by a 
more or less tough film instead of the usual larval joint. 
This larva may be met with occasionally in the loose sand of the sea- 
beach, under logs whose buried portion has become somewhat decomposed ; 
but whether a certain stage of decay must have been reached before the 
larva resorts to the log, or the female for the deposition of the egg, I am, as 
yet, unable to state positively; this much, however, is certain, that the 
process of decomposition is greatly accelerated by the larva which gnaws 
into the wood itself. The masticated wood having passed through its 
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