Early in 1928, at Salmon Arm, B.C., a thirty foot tree of Vine Maple (Acer circinatum Pursh.) which had been dead for three years, was found to be infested with Ceranibycid larvae. Accordingly the tree was felled, cut into two-foot sections, and portions from six inches to half an inch in diameter were put into a wire-screen cage under as natural conditions as possible, and in the shade. As it happened, this shady position seems to have been well chosen, as of seventeen infested maples examined during 1928-1929 only two occurred in the sun.