274 Rerorr or THE DEPARTMENT OF ENTOMOLOGY OF THB 
The eggs were wsually placed on end, apex down, close together 
but were prevented from touching by a layer of gummy shavings 
which extended around each egg. In every case the rows were 
single and extended along one or both sides of the burrows. The 
sticky substance which covers the eggs causes the gummy shay- 
ings to adhere to the shell and when dry to hold them firmly in 
place. In some cases where only three or four eggs were found, 
there was apparently no definite arrangement, the eggs being 
scattered through the gummy mass. In no case were they 
found in definite pockets along the sides of the burrow. Plate 
XXXVII, Fig. 4, is from a photograph of a burrow cut open show- 
ing a row of eggs along one side. Only the ends of the eggs are 
visible. The whole is enlarged to about three times natural size. 
There are some variations in the size of the eggs. One selected 
as being of average size measured .564 mm. by .4 mm. They 
are elongate oval in outline, dull white in color with a delicate 
membranous shell covered with a thin coating of a transparent 
sticky substance. Plate XXXVII, Fig. 5, is from a photomicro- 
graph showing one of the eggs much enlarged. 
The exact period of incubation has not been determined. A 
number of eggs found in the channels September 24, hatched 
September 25. 
Observations on the late broods.—The number of broods for the 
latitude of Western New York has not been determined. Large 
numbers of beetles having the reddish-brown color, character- 
istic of those newly hatched, were found in the bark and twigs 
late in September. Larvee and pupx were also found and in one 
instance a number of them brought into the laboratory trans- 
formed to beetles by October 15. 
Laboratory and insectary observations.—A_ study of the life his- 
tory of this insect is now being made. Trees in the laboratory, 
insectary and orchard are being kept under observation. Young 
healthy plum trees kept in the laboratory and insectary have 
been infested in three ways as follows: First, fourteen beetles 
