d, being about two-thirds
as long as wide, and nearly as long as the four succeeding segments;
this plate is smooth, except on the posterior half, which is rough, with
the front edge irregular and not extending far down the sides. Fine
hairs arise from the front edge and side of the plate, and similar hairs
are scattered over the body and especially around the end. On the upper
side of each segment is a transversely oblong ovate roughened area, with
the front edge slightly convex, and the hinder slightly arcuate. On the
under side of each segment are similar rough horny plates, but arcuate
in front, with the hinder edge straight.

It differs from the larva of the Linden tree borer (Saperda vestita) in
the body being shorter, broader, more hairy, with the tip of the abdomen
flatter and more hairy. The prothoracic segment is broader and flatter,
and the rough portion of the dorsal plates is larger and less
tranversely ovate. The structure of the head shows that its generic
distinctness from Saperda is well founded, as the head is smaller and
flatter, the clypeus being twice as large, and the labrum broad and
short, while in S. vestita it is longer than broad. The mandibles are
much longer and slenderer, and the antennae are much smaller than in S.
vestita.

[Illustration: 103. Linden Tree Beetle.]

[Illustration: 104. Linden Tree Borer.]

The Linden tree borer (Fig. 103) is a greenish snuff-yellow beetle, with
six black spots near the middle of the back; and it is about
eight-tenths of an inch in length, though often smaller. The beetles,
according to Dr. Paul Swift, as quoted by Dr. Harris, were found (in
Philadelphia) upon the small branches and leaves on the 28th day of May,
and it is said that they come out as early as the first of the month,
and continue to make their way through the back of the trunk and large
branches during the whole of the warm season. They immediately fly into
the top of the tree, and there feed upon the epidermis of the tender
twigs, and the petioles of the leaves, often wholly denuding the latter,
and causing the leaves to fall. They deposit their eggs, two or three in
a place, upon the trunk or branches especially about the forks, making
slight incisions or punctures for their reception with their strong
jaws. As many as ninety eggs have been taken from a single beetle. The
grubs (Fig. 104, _e_; _a_, enlarged view of the head seen from above;
_b_, the under view of the same: _c_, side vie