THE SAPEIiDA TRIDENTATA. 
Ill 
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 
and branches, especially about the forks, making slight incis- 
ions or punctures, for their reception, with their strong jaws. 
As many as ninety eggs have been taken from a single beetle. 
The grubs, hatched from these eggs, undermine the bark to 
the extent of six or eight inches, in sinuous channels, or 
penetrate the solid wood an equal distance. It is supposed 
that three years are required to mature the insect. Various 
expedients have been tried to arrest their course, but without 
effect. A stream, thrown into the tops of the trees from the 
hydrant, is often used with good success to dislodge other 
insects } but the borer-beetles, when thus disturbed, take 
wing and hover over the trees till all is quiet, and then alight 
and go to work again. The trunks and branches of some of 
the trees have been washed over with various preparations 
without benefit. Boring the trunk near the ground, and 
putting in sulphur and other drugs, and plugging, have been 
tried with as little effect.” 
This beetle I have taken in Massachusetts only in June, 
mostly between the 1st and 17th, and none after the 20th 
day of the month. The grub closely resembles that of the 
apple-tree borer. Figures of the insect, in all its stages, 
may be seen in the tenth volume of Hovey’s Magazine, 
page 330. 
There is another destructive Saperda, whose history re- 
mains to be written. It is the Saperda tridentata (Plate II. 
Fig. 13), so named by Olivier on account of the tridentate 
or three-toothed red border of its wing-covers. This beetle 
is of a dark brown color, with a tint of gray, owing to a 
thin coating of very short down. It is ornamented with a 
curved line behind the eyes, two stripes on the thorax, and 
a three-toothed or three-branched stripe on the outer edge 
of each wing-cover, of a rusty red color. There are also 
