atus_. Thus far, these two have no common
names. In certain localities they are proving to be very troublesome to
both young and bearing trees. In one block of a nursery in Virginia I
estimated that the Agrilus larvae had ruined one-hundred dollars worth
of young hickory trees. Fortunately, the adult of this species feeds
freely on hickory foliage and can be killed readily under nursery
conditions by spraying with arsenical poisons.

The fourth girdler referred to is our familiar hickory twig-girdler,
_Oncideres cingulatus_. In this case the adult insect cuts a ring-like
furrow around the wood and the portion above dies. The purpose of the
girdle is to provide dead wood in which the young may feed. After the
girdle is made, a process which occupies several hours, and, sometimes
several days, the eggs are laid in the bark above. In central West
Virginia and northward the grubs which hatch from these eggs require two
years in which to reach maturity. In the vicinity of Richmond and
southward, however, the larvae mature in one year. This more rapid
development in the south probably accounts in part for the recent
serious outbreak of this insect in Virginia and the Carolinas.

Each female beetle is capable of girdling several twigs. One female of
about a dozen kept in confinement last autumn made eleven girdles and
deposited 55 eggs. Several of the beetles continued their interesting
operations until after several snows and severe frosts had occurred.

The twig girdler in the beetle stage feeds rather freely on the bark of
twigs. Enough of the surface is eaten to justify the belief that the
beetles may be killed by spraying with arsenical poisons. This treatment
is being tested at the present time. In the cases of all these insects
which sever the branches the wood is killed for the safety and comfort
of the insect as it undergoes further development above the severed
point. There is a period of at least several weeks in each case after
the twig dies during which the insect in one stage or another remains in
it to complete its growth. This affords an opportunity to gather the
twigs and burn them with the assurance that the insects are being
destroyed thereby.

At least some progress has been made in discovering the habits and the
methods of controlling these and various other insects that may be
expected to give nut growers in the north more or less trouble. The
remedies that can be offered at the present time are not in