C. Hay Murray 
283 
On the ventral surface the cup depressions are very much smaller than 
on the dorsal, giving, in fact, little more than room for the base of the 
bristles which are themselves rather finer. Those on the dorsal surface 
are very conspicuous indeed as may be seen from the accompanying 
photograph (Plate XXIII, Fig. 1) taken of the exoskeleton after boiling 
in caustic potash. The white spots, seen mostly on the second segment, 
are holes left by bristles which have fallen out. The bristles seem to 
be very fragile, as in almost every bug which was examined many were 
found snapped straight across, this being possibly a sign of age, like 
the tattered and worn condition of a bee’s wing. Among the bristles 
there are two varieties, the one simple, like hedgehog spines, while the 
other is stouter, serrated up one edge, and ending at the apex in one or 
more spikes, usually three. These serrated bristles, which are slightly 
curved, have a cross section similar to that of a razor blade, the thin 
edge being serrated (Fig. 2). The simple spines are greatly out¬ 
numbered by the serrated, and are always arranged more or less regu¬ 
larly, while the serrated do not seem to follow any particular plan. 
On the antennae both kinds appear, the two apical joints having long 
simple pointed ones arranged in straight lines, and usually in pairs, while 
the two basal joints bear the serrated variety with spiked tops (Fig. 3). 
The basal joint is thickly supplied with bristles at its apex, and to about 
half way down, but is practically destitute of any on the proximal half. 
On the labium, but not on its first j oint, the bristles are simple and arranged 
in pairs all pointing to the tip of the organ, while elsewhere on the 
head are found the spiked serrated kind. Round the profile of the 
head viewed from the dorsal surface, the bristles are rather stouter and 
more serrated than elsewhere. Above the eye there is a collection of 
a few longer serrated bristles, and one or two on the eye itself. On the 
dorsal surface of the head, as shown in the sketch, is a bristle-free area 
(Fig. 3). This marks the locations of the attachments of the muscles 
which work the pharyngeal pump. 
The under surface of the head is clothed rather more sparsely with 
bristles of the serrated type alone. These are arranged mostly at the 
edges, leaving the middle line where the proboscis lies when at rest, 
bristle free, and this clear space is continued along the ventral surface 
of the thorax which is grooved for the reception of the proboscis. The 
thorax otherwise is thickly covered with bristles. 
The legs, Figs. 19 and 20 (which will be treated in detail later on), 
bear both kinds of bristle, the simple being on the inner surface; there 
are also at the apex of each tibia several very stout short spines, as 
19—2 
