THE BORERS OF CERTAIN SHADE TREES. 591 
thoracic ring, being rather large. The prothoracie, or seg- 
ment just behind the head, is transversely oblong, being 
about twice as broad as long ; there is a pale dorsal corneous 
transversely oblong shield, 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 behind 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 Saperda ves- 
lita Say, 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 transversely ovate. The structure 
of the head shows that its generic distinctness from Saperda 
is well founded, as the head is smaller and flatter, the cly- 
peus 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 anteunz are much 
smaller than in S. vestita. 
Saperda vestita. 
Fig. 118. 
Saperda vestita, larva. 
