NOV., '06] ENTOMOLOGICAL NEWS. 315 



reported that his maple trees were being defoliated by some 

 insect which, from his description of the injury, was probably 

 the same pest. 



During the seasons, of 1902 and 1903 stems were gathered 

 and placed in breeding cages, but all larvae failed to transform. 

 In 1904 material was scarce. A few fallen stems were placed 

 in a box having fine wire netting top and bottom. This was 

 filled with sterilized soil, the stems laid upon the surface of the 

 soil, and the box buried level with the ground in a shady spot 

 in a group of shrubbery. Before planting the cage, one para- 

 site emerged. When the box was unearthed in 1905 no living 

 insects came from it. 



In 1905 we continued our observations on the Whitney Ave- 

 nue trees, and it was noticed that the stems falling to the 

 ground were often found empty or with parasitized borers in 

 them. Some of the larvae had evidently died before reaching 

 maturity, as the burrow was abnormally small or only partially 

 excavated. One stem had a hymenopterous cocoon in the 

 burrow. Another contained a dipterous larva, feeding upon 

 the borer. Some of the stems, however, showed the exit holes 

 where the adults had emerged. It was suggested that all stems 

 dropping early might be either diseased or parasitized. We 

 therefore climbed the trees and gathered stems which had not 

 fallen. In these stems we found larvae that seemed to be vigor- 

 ous and healthy. Two cages like the one used in 1904, and 

 measuring 6 l /2 x 4 inches inside and 3 inches deep, were buried 

 in the soil June 2Oth, 1905, immediately after placing the 

 infested stems in them. The cages were dug up May 3d, 1906, 

 and contained a number of adult sawflies which had alreadv 

 emerged from their cocoons, although the leaves of the sugar 

 maples were but just unfolding. 



In 1905, Dr. Francis Bacon, of 32 High Street, New Haven, 

 reported that some insect was defoliating his trees. My assist- 

 ant. Air. Walden, examined the trees and found the same insect 

 at work on them, and a large proportion of the leaves had 

 fallen and covered the ground. 



Under date of May I4th, 1906, in response to a letter of 

 inquiry from me, Mr. White wrote that the insect was on the 



