S HA DE TREE INS ECTS 
The round-headed borers, or those belonging to the 
family CERAMBYCID. 
The flat-headed borers, or those belonging to the family 
BUPRESTID&. 
The bark beetles, or those belonging to the family 
SCOLYTID#. 
ROUND-HEADED BORERS 
56. CERAMBYCID. The beetles of this family are called 
the “long-horn beetles,” from the long antennz or feelers, which 
usually equal or exceed the length of the body. The body is 
usually more or less cylindrical, although some species are more 
or less flattened. 
37. The larve are called “round-headed borers” because they 
usually bore into woody plant tissue, and are more or less cylindri- 
cal in form, with the segments well marked. ‘The legs are rudi- 
mentary or wanting, the thorax enlarged but round, and the 
mouth parts strong, well developed, and more or less contracted 
within the enlarged thorax. For the most part these larve burrow 
into dead or dying wood, but a few of them will attack and fre- 
quently kill living trees. 
4. MAPLE BORER 
Family CERAMBYCID. Species Plagionotus speciosus Say 
s8. This is one of the most destructive of the round-headed 
borers, and readily attacks trees in apparently good health. It is 
a native American, and its work was described as early as 1828. 
It has been discussed in the literature under the following names: 
Glycobius speciosus Say, clytus speciosus Say, Clytus hayit and 
Arhopolus speciosus Say. 
59. The sugar maple is the principal food plant attacked, but 
the other maples suffer at times. 
60. Symptoms. ‘The beetles are sun lovers, so the portion of 
the trunk or limbs exposed to the bright sunlight is the most liable 
to attack. In the fall, the location of the young larve in the bark 
can be detected by a rusty, irregular discoloration of the bark 
about the size of a cent, and by the frass, or castings, which have 
been expelled from the burrow. These castings are frequently in 
Page 12 
