Mr. Wm. Saunders, of London, who has recentiy been re-elected president of the Entomological Society of Ontario, says, that the Maple Egerian, known also as "the legged maple borer,"AEgeria acerni, has prevailed during the past year in the neighborhood of London to an alarming extent, to the serious injury of some of our shade trees. These insects, which pass the winter in the larval state under the bark of the maple trees, change to chrysalids early in June, and about the middle of that month they protrude themselves from the bark to the extent of about half an inch, when in a very short time the mature insect escapes, leaving the empty chrysalis behind it.