592 THE BORERS OF CERTAIN SHADE TREES. 
The Linden Tree-borer (Saperda vestita of Say, Fig. 
117) 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 WX 
immediately fly into the top of the ç S#erda calcarata, larva. 
tree, and there feed upon the epidermis of the tender 
twigs, and the petioles of the leaves, often wholly denuding 
Fig. 120. the latter, and caus- 
ing 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 incis- 
ions or punctures for 
their reception with 
their strong jaws. 
As many as ninety 
Prionus brevicornis and pupa. eggs have been 
taken from a single beetle. The grubs (Fig. 118e; qd; 
enlarged view of the head seen from above; b, the under 
view of the same; ¢, side view, and d, two rings of the body 
enlarged), hatched from these eggs, undermine the bark to 
the extent of six or eight inches, in sinuous channels, or pen- 
Fig. 119. 
