POLYGRAPHUS MINIMUS, MS. 253 

already developed from the eggs. I am unable to say whether 
these larve were the first or second generation of the year. 
A small chamber is grooved in the inner bark, and in this 
the male pairs with several females. These latter then bore 
their egg-galleries away from the central chamber. The larve 
on hatching mine away at various angles from the egg-galleries 
of the mother beetles. The & would appear to pair with from 
4—6 @ beetles. The beetles appear to require moist bark to 
bore in, as they are only to be found either in bark still alive, 
though nearly dead, orin moist places in newly dead bark, 
I have never found them in dry bark. 
In the third week in June another generation (second or 
third?) is commenced, as beetles were found, matured from the 
eggs and larve discovered in the third week in May, laying eggs 
in a similar manner to the May beetles. No larve had deve- 
loped. A spring generation would thus appear to take from four 
to five weeks from egg to fullv developed beetle. 
This is as far*as [ have carried the life history. 
Locality from where reported. 
This minute Scolytid is plentiful in the Jaunsar and Tehri- 
Garhwal blue pine forests in the North-West Himalayas, It 
was discovered in 1902. 
Relations to the Forest. 
As far as present observation goes, this Polygraphus would 
appear to do little damage to the tree, since it has only been 
found in the bole of trees from the pole stage upwards. It 
comes in after the Blue Pine Tomicus, and probably waits 
until that insect has undermined the vitality of the infested 
tree. It remains in the tree, however, longer and will undoubt- 
edly attack bark that is no longer fresh. 
Protection and Remedtes. 
These will be the same as already given for the Blue Pine 
Tomicus and the other Polygraphus beetles. In getting rid 
of them this beetle will be likewise killed off, 
