THe eggs of this insect were found on a small branch of golden willow in Beverly, Mass., March 14, 1900, in a nursery, close to fruit stock of various kinds. The mass, consisting of 220 eggs, was kept at the temperature of the laboratory, which was considerably higher than that outside. Notwithstanding this fact, none of the eggs hatched till April 23, within forty-eight hours of which time, however, all the larvæ had emerged.

Egg (Plate 4, Figs. 1 and 3).—Eggs placed close together in regular rows, forming a compact mass, in this case about twice as long as broad and in one layer. Egg about .6 mm, long and .45 mm, broad at top, which is nearly flat. Just inside the rounded edge of the top a brown ring encloses an area bright steely gray in colour, and containing a small brown depression in its centre; lateral surface of egg and rounded edge steely gray.