REPORT OF THE STATE ENTOMOLOGIST 1903 171 



Investigations of spruce Aug. 12 on the tract at Big Moose 

 which was burned June 3 showed that trees giving no evidence of 

 insect attack on July 3 were infested with the larvae of a bupre- 

 stid, probably Chrysobothris scabripennis Lap. & 

 Gory. This record is of interest as showing when the trees are 

 likely to be infested by this class of borers, which operate largely 

 in the sapwood and do not seriously affect the value of the lumber. 

 This beetle was fairly common on standing but badly burned 

 spruce. The buprestid showed a decided preference for larger 

 trees, though those which were badly scorched so that the inner 

 bark had dried were not infested. Two or three specimens of 

 Xylotrechus undulatus Say were taken on spruce, and 

 P h y m atodes dimidiatus Kirby was also met with in 

 sparing numbers. The bark borers noticed above had made con- 

 siderable progress. 



Tamarack. Investigations July 9 of a section burned May 14 

 at Lake Clear Junction resulted in finding a tamarack infested by 

 a scolytid, possibly T o m i c u s p i n i Say. A specimen of Lep- 

 tura, L. subhamata Rand., was also taken from a burned 

 trunk. 



Birch. The yellow birches at Big Moose on the tract burned 

 over Ap. 30 were in early July, in many cases, slightly green 

 at the top and were being mined by Dryocoetes eich- 

 h o f f i Hopk. ; specially was this the case where the trunks 

 were scorched seriously enough to interfere with the circulation 

 of sap. The common flat-headed borer, Chrysobothris 

 femo r a t a Fabr., was taken on a fallen birch. The pigeon 

 tremex, T . c o 1 u m b a Linn., was observed in small numbers 

 on birch, but investigations showed that its attack was confined to 

 more or less decayed trees. This insect was also met with under 

 the same conditions on maple and beech trees. Birch trees were 

 relatively free from insect attack in August, probably because 

 the thin bark permitted rapid evaporation and the consequent 

 drying Avas unfavorable for borers, through Dryoeoetes had made 

 considerable progress in. the large trees. 



Hemlock. The 6-spotted buprestid, Melanophila ful- 

 voguttata Harr., was numerous at Big Moose July 3 in the 



