43 
destructive species and the great losses to all kinds of crops 
sustained in different regions of New England from locusts are 
all owing to this insect. 
As ithas been found that the best method of combating this 
insect consists in plowing the ground after eggs have been laid, 
it is necessary to study these in detail, and I quote from bulletins 
8 and 17 published by the State Experiment Station. 
How the eggs are laid. In my report of 1888, considerable 
stress was laid upon the manner and location in which eggs are 
laid by the Rocky-mountain locust and allied species As the 
remedy applied this year depends almost entirely upon this { 
deem it important to repeat and enlarge upon what was written 
at that time. The following figures will illustrate this point 
better than words. The holes for the reception of the eggs are 
made by means of two pairs of horny. valves at the tip of the 
abdomen of the female (Fig. 23, b and c). These open and 
shut rapidly, and are well adapted to exe- 
cute this function. The female pressing the 
tip of her abomen forcibly against the soil, 
rapidly opens and shuts these hard and point- 
ed valves, and soon pushes them into the 
lens 4 , FIG. 23.--Rock y-Moun- 
ground, thus drilling a hole. Fig. 24 illus- tain nocust—Analchar- 
trates this action, and the various positions 2¢ters of female, 0. 
A showing horny valves, 
assumed by the female are plainly indicated. » anac. (After Riley.) 
aaa". 

o 
W/ ADDN \4 
Nit eo =e 




FIG, 24.--Rocky-Mountain Locust, in the actof laying eggs. (After Riley.) 
In ashort time nearly the entire and greatly extended abdo- 
men is inserted in a little curved and more or less oblique cav- 
