392 SPH AEROTRYPES SIWALIKENSIS, n. sp. 

Locality from where reported. 
The insect is fairly plentiful in the Sal forests of the Dun. 
plateau, N.-W. India. Elevation 2,000-2,500 feet. It was 
discovered by the writer in September 1got. 
Relations to the Forest. 
Although the range of this beetle, as far as at present reported 
is limited, it is probable that it will be found widely extended 
throughout the Sal forests of the submontane regions of the 
Himalayas from West to East, and research may show it to be 
present in the Sal tracts of other parts of the country. Its lifes 
history, as at present observed, shows that it possesses the power 
of rapidly increasing in numbers owing to the practice of passing 
through several generations inthe year. It requires fresh came 
bium to deposit its eggs in, and will necessarily go to green 
trees to find thisif the supply of newly-felled or dying ones. 
were, for any reason, to become diminished in the forest. 
In order to enable me to study the life-history of the pest, 
whose traces were plentiful in dead bark and wood in the forests, 
the Divisional officer, Mr. Milward, had felled for me two large 
healthy living trees in August Igo1. As the above record 
shows, by September 22nd they contained numbers of laryze 
both in the bole and in the larger branches of the crown. By 
the time the bark was dry one of thetrees was covered from 
top to bottom with the egg and larval-galleries of this Scolytid. 
The galleries were not quite so numerous on the other tree. 
Subsequently beetles were found attacking standing living 
stag-headed trees. Other trees were felled for me in the spring 
of the following year. Throughout my observations were 
greatly assisted by the Range officer. 
Protection and Remedies. 
All trees felled should be at once barked or, if they are left 
as trap trees with the bark on, they should be barked as soon 
as they are full of larvze and before these have pupated and 
begun to issue as beetles. In leases given for the felling of 
Sal trees in coupes a clause should be inserted enforcing the 
barking of the trees as soon as felled, 
