. the insects. 
LOCUSTS. 276 
were also used to a small extent, and useful work was done by driving the 
young into heaps of straw and bushes which were then set on fire, In this 
way many thousands of maunds of young locusts were destroyed, and the 
actual crops were in many places protected. The numbers of the locusts, 
however, that bred in waste places in the Punjab was so enormous that success 
was only partial, and vast hordes became full grown and acquired wings, 
Towards the latter part of May large flights of these young locusts began to 
pass over Central India and the North-West Provinces into the Central Pro- 
vinces and Bengal, at the same time penetrating into Kathiawar, During the 
months of June, July,and August these flights seem to have flown about from 
district to district, descending at intervals to devour the young kharif crops 
and doing a good deal of damage over restricted areas, especially in Bengal. 
They did not lay any eggs, however, and little was heard of them after 
August, the supposition being that by this time they had been pretty com- 
pletely destroyed by the birds and unfavourable climatic condition of the 
damp regions into which they had penetrated. 
The immediate result of the departure of these flights seems to have been 
to clear the Punjab of locusts, but the insect was still prevalent in Sind and 
Rajputana, and soon after the commencement of the rains of the south-west 
monsoon flights began to be again reported from the Punjab. During the 
rainy season of 1891 egg-laying went on as usual in Sind and Rajputana, while 
in the Punjab eggs were reported in comparatively small numbers, at first from 
the south-eastern districts and afterwards throughout the whole area, thus 
pointing to the supposition that the eggs were laid by flights from Rajputana. 
Breeding seems to have gone on at intervals throughout the rainy season of 
1891, young locusts being still reported in the Punjab Salt Range in November, 
But they were very much fewer than before, and the birds—especially the 
Rosy-pastor (Pastor roseus)—destroyed them in vast numbers, The locusts 
themselves also were so much parasitised and diseased that the work of the 
people in destroying them was very much lightened, and by the close of the 
year the pest seems to have been pretty completely wiped out. 
In March, 1892, a fewlocustsagain appeared in Sind and the western frontier 
of the Punjab and laid eggs in Dera Ismail Khan, while in May some stray 
flights penetrated into the North-West Provinces and Bengal. Little damage, 
however, has been reported, and the insects seem to have been too few to 
cause any anxiety. 
Tt will be remembered that the only important points in the life history 
of the insect on which any serious doubts were indi- 
cated in the previous report were upon the subject of 
the number of generation in the year and the relation- 
ship borne by the young locusts which hatch out in the spring to those which 
hatch out in the autumn, An attempt bas since been made to setile these 
Notes on the life history of 
