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Indian 'Forest Records. 
[VoL. II. 
Part III: THE SCOLYTID (SCOLYTID^E) AND PLATYPID 
(PLATYPID/E) BARK AND WOOD BEETLES, 
As far as present observations have led, four, and perhap a fifth, 
Scolytid and Platypid iusects are known to infest the oaks. Two new 
bark boring beetles Dryoccetes Uewetti, n. sp. and Sphaerotrypes qtierci, n. 
sp., and the wood borers Clirumesus globulus, n. sp., Diapus impressus 
and D. sp. prox impressus. 
THE BARK BORERS. 
DRYOCOETES HEWETTI, Steb. 
-ffe/ereJi^e.—Stebbing. On “Some undescribed Sc lytidae of Economic importance from 
the Indian Region,” Indian Forest Memoirs, Zoology Series, Vol. I, Ft. i (p. 11.) 
Nature of Attack. 
The male beetle bores through the bark of the tree and eats out a 
pairing chamber, squarish in shape, in the bast and sap wood. Three or 
four female beetles successively enter the pairing chamber through 
the male entrance hole (the first one enlarging the entrance gallery in 
doing so) and after pairing with the male bore galleries away from the 
pairing chamber. These galleries are eaten ont in a direction at right 
angles to the long axis of the tree (in standing trees) and typically two 
females bore in one direction and the other two in the opposite one, each 
female or egg gallery being distinct from the other ; the eggs are 
deposited on either side of these egg galleries and the larvae on hatching 
out bore away in a direction at right angles to the egg gallery, the larval 
galleries being straight. 
When sufficiently numerous, the beetles and their larvae remove all the 
cambium or bast layer of the tree and the tree dies. 
Previous Record of Insect. 
I have no previous record of this insect. 
