172 NEW YORK STATE MUSEUM 



burning of Ap. 30, on large hemlocks. Though they were some- 

 what green, none were observed! on very small dead trees. 'A 

 cerambicid, Xylotrechus undulatus Say, was observed 

 in some numbers. Examination of these trees Aug. 10 resulted 

 in finding some infested which showed no evidence of insect at- 

 tack July 3, the larvae of Melanophila fulvoguttata 

 Harr. probably being the principal offender. This is perhaps 

 to be explained by this buprestid being on the wing mostly dur- 

 ing July, and consequently there would not be a serious infesta- 

 tion till after the adults had flown for a period. 



Balsam. Investigations July 2 on an area near Big Moose, 

 burned over Ap. 30 resulted in finding several specimens of 

 h r y s o b o t h r i s p u s i 1 1 a Lap. & Gory on this tree, while 

 C. scabripennis Lap. & Gory, were fairly common on the 

 standing but badly burned balsams. Investigations Aug. 12 

 showed that the balsam compared with spruce Avas quite exempt 

 from attack, probably due to the thinness of the bark and con- 

 sequently quick drying of the sapwood. The lined ambrosia 

 beetle, X y 1 o t e r u s lineatus Kirby, was found in small 

 numbers in July and its operations had progressed but little in 

 August. 



Poplar. Examinations July 7 of an area near Big Moose 

 burned over May 14 resulted in finding a large species of Xyle- 

 borus in poplar. 



Conclusions. Investigations the present season have shown that, 

 while a number of insects are liable to attack burned trees 

 within four to six weeks after injury, no very material injury is 

 likely to result during the summer, except possibly from the 

 work of ambrosia beetles. The other species either confine their 

 operations so largely to the bark or else occur in such small 

 numbers that for the present they may be neglected.. The am- 

 brosia beetles rarely extend their operations to a greater depth 

 I han 2 or 3 inches and as a consequence a considerable propor- 

 tion of the lumber will be free of injury. This would hardly 

 prove to be ,the case if the trees are allowed to remain standing 

 a second season, at which time they will undoubtedly offer at- 



