iv 
Ips longifolia. 
It is of interest that the bark-beetle of Himalayan pines is parasitised 
by a species of Roptrocerus, a genus that is an enemy of Ips in Europe 
and North America. 
* * * 
The illustrations are by Mr. A. J. Engel Terzi, Natural History 
Museum, London, with the exception of figures 8, 11 and 20, which are 
by B. Jung Bahadur Singh, Forest Entomologist’s Artist. 
C. F. C. BEESON, 
The 1st October 1921. Forest Entoinologist. 
