32 



evidently died in the summer of 1899. At the time of our examina- 

 tion the bark was found to be infested with great numbers of Poly- 

 graphia, principally adults, also by round-headed and flat-headed 

 bark and wood-boring larvse, but no examples of the spruce-destroying 

 Dendroctonus were found. 



* The other trees peeled in June or July, 1899, were, at the time of 

 our examination, living, the leaves green, and the bark above the 

 peeled portion was filled with sap. The bark of these trees was not 

 infested by insects of any kind, so far as we could observe. The 

 peeled trees in both lots ranged from 8 or 9 inches to possibly 18 

 inches in diameter, but not many of them were over 12 inches. 



On June 7 some large spruce were examined near the inlet to Par- 

 mecheenee Lake which had been girdled and peeled in about 1895. 

 One that had been hack-girdled near the base and again about 6 feet 

 above had been infested with Dendroctonus, and the broods had 



W 



W i 



if? 1 ' 



mi 



I'Vil- 



\^mf 



Iff Ml 







V 



rcv\ 



Fig. 2. 



-Trees girdled by different methods: o, Hack-girdled; b, girdled to heartwood: 

 girdled and peeled; d, hack and belt-girdled. 



hack- 



developed and emerged. The trees that were peeled, however, were 

 not attacked by Dendroctonus, but had been infested by great num- 

 bers of round-headed bark and wood borers of the genus Tetropium. 

 On June 8 more hack-girdled and peeled spruce were examined 

 near Rump Pond Camp, which had been infested with Polygraphia 

 and other insects, but not with Dendroctonus. 



REPORT ON GIRDLING EXPERIMENTS BY MR. AUSTIN CARY. 



A number of spruce trees were girdled on May 29 and June 13 in 

 the vicinity of Wight's cuttings on Twin Brook; on June 6 near 

 Hamel's Camp, on the Little Magalloway; and on June 16 near Big 

 Island Pond, at the source of the Kennebago River. Upon the writer's 

 return home, written instructions were sent to Mr. Cary regarding the 

 girdling experiments and observations desirable for him to make on 

 the habits and life history of the beetle. The different methods 

 of gin] ling recommended are indicated in fig. 2. The satisfactory 



