Packard.] THE POPULATION OF AN APPLE TEEE. 169 
tracks becoming broader as the worm has increased in size.” 
The beetle appears late in August in New York. It is a 
brown beetle, its wing-covers prickly, whence the name Lep- 
tostylus aculiferus , and with a white, curved or Y-shaped 
band behind the middle of the wing-covers, and a black streak 
on their hind edge. It is about a third of an inch long. 
The Apple Leiopus (Fig. 134) is a new comer in our or¬ 
chards, having lately been found in all its stages of growth 
Fig, 134. Fig. 135. 
Leiopus of Prickly Ash. 
in the rotten limbs. The grub is so closely allied to that 
of another species, Leiopus xanthoxyli (Fig. 135, beetle; 
136, a, larva ; 5, head fig. 136 . 
seen from above; and 
c, seen from beneath), 
that a wood-cut draw¬ 
ing will answer for both. 
It differs mainly in hav¬ 
ing a smaller head and 
a slenderer body. It 
seems from what little 
we know of the habits 
of these insects that 
there is probably but 
one brood of beetles a year, and that they fly about and lay 
their eggs on the bark of the tree late in June, and probably 
9 
