Part 1.] Stebbixg : Insect Pests of the Himalayan Oaks. 
9 
As far as I am aware, the fact that its larva, whilst attaining to full 
growth, destroys so much of the bast layer has never been previously 
recorded, and a complete study of its life history by those in a position to 
do so is urgently needed. 
Points in the Life History requiring further observations. 
1. When the eggs are laid. 
2. How long the larva spends in this stage of its metamorphosis 
feeding in the bast laj'er and sap wood. 
3. When the larva first commences to bore into the heart wood of the 
tree, and how long this tunnel and the pupating chamber take to make. 
4. Where the larva passes the winter. 
XYLOTRECHUS STEBBINQI, Gahan. 
Reference.— CiMha,-a, Fauna British India, Coleop. Vol. I, Cerambycidaj No. 274 (p. 244) 
Nature of Attack. 
The eggs are laid by the beetle on the bark of living or newly felled 
Mora oak trees. The grubs on hatching out feed entirely in the bast 
and sap wood until full grown, eating out winding galleries. 
They then bore down into the inner sap wood, eat out a pupal 
chamber, and pupate in it. 
Previous Record of Insect. 
This insect w'as taken by myself in oak in Bashahr State, North- 
Western Himalaya, in 1901. 
It was sent to the British Museum where Mr. Gahan, the well-known 
authority on the family, determined it as an unrecorded species. It is 
also an inhabitant of Tibet. 
Distribution. 
The insect is recorded from Bashahr State in the North-Western 
Himalayas and Tibet. Probably spread throughout the Morn oak belt 
in the Western Himalaya, 
B 
