L'Ti Retort ok the Detaiitment of Entomology of the 



The eggs were usually 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 shav- 

 ings to adhere to the shell and when dij 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 phoitograph 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. 



Ohservations 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. Larvae and pupae 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 

 Jbceu infested in three wayg ag fpljpw§; First, fourteen beetles 



