166 
HALF HOUHS WITH INSECTS. [Packard. 
greenish black above, with a brassy hue especially on the 
raised transverse spots. It may be seen from May until 
July sunning itself on the bark of the trees in the crevices 
of which it inserts its eggs. As in the common borer just 
described it gnaws its way into the heart of the tree, but it 
only lives over one summer. From the flattened form of its 
body it makes a broad, flat, and not a cylindrical hole, like 
that of the common borer, the gallery a little over an inch 
in length leading upwards from where the young larva began 
to work. A very similar species, C. Harrisii , or Harris’ 
apple borer, is sometimes very destructive to the apple, 
though the red maple seems to have been its original home. 
The same remedies should be applied in dealing with these 
borers as with the young of the striped beetle. 
The white-lined Psenocerus. — Though this beetle in the 
larva state is more commonly found tunnelling the stems of 
fig. 131 currant bushes, and sometimes boring into grape 
stems, yet it has been known to be injurious in 
apple orchards. The beetle is a “ longicorn,” with 
a very round, cylindrical body. It is dark red¬ 
dish-brown, with a swelling at the base of the 
wing-covers, an oblique yellowish white line on 
the basal third, and a broad curved white line 
on the outer third of the wing-cover. The grub 
(Fig. 131, enlarged about three times) is nearly 
half an inch in length, with a honey yellow head scarcely 
half as wide as the body, while the segments of the body 
are rather convex, each having two rows of minute warts. 
It devours the sap wood and inner portion of the bark and 
also the pith of the branches, thus locally killing the termi¬ 
nal twigs, and causing the bark to shrivel and peel off, 
leaving a distinct “dead line.” Each grub lives in a burrow 
about an inch and a half long, and five such burrows occur 
in a portion of the branch five inches long. The grubs be¬ 
come fully grown during the middle of August. Dr. Fitch 
6 
W 
Psenocerus 
