145 
broad, ellipsoidal form. 'The structure of the ovipositor of the beetle leads 
one to infer that the egg is simply dropped by the female at any spot in 
the gallery, where it adheres to the side of the latter until the larve are 
hatched. In none of the females which I dissected were there more than 
seven or cight eggs of such a size as to indicate that they were about to 
be laid, so that the insect probably deposits not more than two dozen 
during its life. (PI. I, fig. 1.) 
The larva.—Length over dorsum when full grown, 112 millimeters; ecireum- 
ference, 18 to 20 millimeters; head, 12 millimeters long and 11 millimeters wide; 
feet, 9 millimeters in length. It is a very soft, fleshy grub, the skin of which is 
transversely doubled in numerous folds, so that it is very difficult to differentiate 
the body segments. The skin is of a dirty, light ocher, the surface being smooth 
in spots and in other parts covered with patches of very minute tubercles or 
spines, which give it the appearance of shagreen. The body is covered with 
numerous, very fine, golden or dull-whitish, curved hairs, which stand out nearly 
at right angles to the surface. The head is of a much darker color than the 
body and horny or chitinous in structure; it is hemispherical and so attached 
to the body that the mouth projects forward. At each side of the head, projecting 
downward and forward, is a slender, four-jointed antenna. The dark-brown, 
slender, toothed mandibles, half the length of the entire head, are so placed as 
to enable the insect to gnaw its way through the plant substance with great 
facility. The maxille are rather conspicuous and are situated next to the 
mandibles on the under side of the head and on each side of the very inconspicuous 
lower lip or labium. The maxillary palpi are 4-jointed; those of the labrum 2- 
jointed. The labrum is transversely elliptical, the sides slightly covering the 
inner margins of the mandibles. The color of the labrum and that of the 
clypeus (the trapezoidal portion above the upper lip) is the same as that of 
the rest of the head. The mouth parts, with the exception of the tips of the 
mandibles, are covered with golden bristle-like hairs, which serve as tactile sense 
organs. 
This grub has no eyes. The top and front of the head, therefore, present an 
unbroken surface, which is somewhat shiny and covered with punctures, which 
are almost confluent; it is nearly destitute of hairs or bristles. (PI. 1, fig. 2.) 
Each of the first 3 segments of the body posterior to the head bears a pair of 
legs. The first leg joint projects downward, while the succeeding ones are 
inclined outward and forward; the feet are armed with a single blunt claw 
and densely covered with light-brown bristle-like hairs, more thickly placed at 
the tips. 
The body is curved, so that the length of the ventrum is much less than that of 
the dorsum. It is folded or transversely corrugated so as to render it difficult to 
distinguish the 13 segments of which it is composed, this being the easier toward 
the anal extremity, where the folds are fewer. 
Beginning with the first thoracic segment and excepting the second and third, 
each remaining one to the eleventh bears a pair of dark-brown subcireular 
spiracles or openings to the tracheal or respiratory system. These spiracles are 
chitinous in structure and are composed of an outer broken ring of radiating 
lines and an inner nearly cireular portion, which is the true opening. They 
may be opened or closed at will. Their large size and great prominence is 
doubtless owing to the fact that the insect lives embedded in a mass of material 
in which the supply of oxygen is limited. 
The last three segments of the grub’s body are nearly smooth and only sparsely 
covered with hair, and in a living specimen the hinder end is semitransparent 
