570 
THE STUDY OF INSECTS. 
wing-cover. Its larva bores in the wood of pine-trees. On 
one occasion the writer found many of them in a pine-tree 
eight inches in diameter, which they had bored through and 
through. When the larva is full grown it makes a hole 
nearly through the thick bark of the tree, so that it may 
easily push its way out after its transformations; it then 
retreats a short distance, and makes a little ring of chips 
around itself, between the bark and the wood, and changes 
to a pupa within this rude cocoon. The adult beetle remains 
in this pupal cell through the winter. 
The Cloaked Knotty-horn, Desmocerus palliatus (Des- 
moc'e-rus pal-li-a'tus).—This beautiful insect is of a dark- 
blue color, with greenish reflections. 
The basal part of the wing-covers is 
orange-yellow, giving the insect the 
appearance of having a yellow cape 
thrown over its shoulders (Fig. 693). 
The segments in the middle of the 
antennae are thickened at the outer 
end, so that they look like a series 
of knots. The adult is found quite 
common in June and July on elder, in the pith of which the 
larva bores. 
The Beautiful Maple-borer, Plagionotus speciosus (Plag-i-o- 
no'tus spe-ci-o'sus). — This is a handsome insect, marked 
with black and yellow, as indicated in Fig¬ 
ure 694. It lays its eggs in midsummer 
on the trunks of sugar-maples, in the wood 
of which the larvae bore. If an infested 
tree be examined in the spring the pres¬ 
ence of these borers can be detected by 
the dust that falls from the burrows. The 
larvae can be destroyed at this time by the 
use of a knife and a stiff wire. 
T^e Locust-borer, Cyllene robince (Cyl- 
le'ne ro-bin'i-ae).—To the enthusiastic en- 
