October, 1929] WHITE PIXE WEEVIL 23 



NEWLY EMERGED ADULTS 



When the weevils emerge from the pupal stage they do not vacate their 

 pupal cells immediately but remain in this location for two or more 

 weeks. As late as the middle of September many weevils have emerged 

 and are within the leader. Xo exit holes in the leaders nor weevils in 

 the field, were found September 10, 1927, when several plantations were 

 scouted. In general, we can say that the weevils do not leave the lead- 

 er much before the middle of September. Emergence from the leader is 

 continued well into October. For this reason, when interpreting Chart 

 I, it must be remembered that newly emerged adults may be present in 

 the leader the last of July, but thej' are not found outside of the leader 

 for several weeks. 



After they leave the leader through circular holes in the loose bark the 

 weevils immediately go to all parts of the tree and feed. The tips of the 

 lateral branches, in the region of new growth, seem particularly attrac- 

 tive. The weevils eat small patches of bark and cambium at this time, 

 but cause no appreciable damage to the tree. 



As shown in the first part of this paper, the adults of this generation 

 seldom, if ever, mate in the fall. Xo egg laying takes place at this sea- 

 son. Dispersion is believed to take place in the spring. 



The weevils after feeding for a varying length of time hibernate in the 

 duff below the tree from which the}^ have emerged. Many weevils were 

 found on infested trees examined October 12, 1928. Usually the weevils 

 gradually disappear from the tree about the latter part of October and 

 enter hibernation. Hibernation will take place even if the weather is 

 warm. They hibernate in the duff close to or on top of the ground but 

 do not enter the soil. The position of the weevils in the duff varies from 

 just beneath the surface needles to a point next to the underlying ground, 

 a distance of three inches. Graham (1926), with a modification of the 

 Berlese trap, succeeded in securing ^\^eevils from hibernating material 

 with little effort. The task of attempting to find weevils without using 

 some special apparatus is difficult, due to their close resemblance to part- 

 icles of duff. 



THE NORTHERN PINE WEEVIL 



Pissodes approximatus, Hopkins 



In this investigation a weevil, presumably Pissodes opproximatus, Hop- 

 kins, was found attacking the trunk and roots of white pine. The eggs 

 are laid in the trunk about a foot from the ground. The larvae upon 

 hatching work under the bark of the trunk and larger roots, usually kill- 

 ing the tree. 



The life history of P. approximatus appears to be similar to that of 

 P. slrobi. In 1926 adults in white pine were first found at Madbuiy, 

 N. H., August 6. Specimens were taken the latter .part of August from 

 the roots of eight year old red pine located in Keene, N. H. On August 

 30, 1927, fifteen adults, presumed to be P. approximatus, were taken from 



