178 
SUMMARY AND GENERAL COMPARISON OF 
LIFE HISTORIES. 
The foregoing discussion of separate species of strawberry insects 
has given all the information in my possession respecting remedies 
available against each, and the proper time for applying them; 
but it remains to summarize the facts in such form that the straw- 
berry grower, whose field is infested by more than one noxious 
species, may be guided to such a choice of measures and of times 
of application as will enable him to combat all his insect enemies 
with the least trouble and expense. 
The first thing needful will evidently be a calendar of the injuri- 
ous species, such as will enable him to tell in what condition every 
insect infesting the field will be at each season of the year. With 
this he may see at once what will result to each species from each 
‘measure proposed. I have consequently prepared a table of dates 
and stages of the insects treated, by consulting which one may see 
at a glance the periods of the transformations, and the stages in 
which each species occurs at any time. Running along the head- 
lines of the table, one has a brief epitome of the life history of 
each species; and following the vertical column, one may learn in 
what stage and situation each will be found at any given period. 
This table is, of course, far from complete, since the life histories 
of but few species have been made out in full. In some minor 
instances it is not impossible that it may be found inaccurate, 
although all possible pains have been taken to select the data from 
the best authorities, as far as they were not derived from our per- 
sonal experience. Observations made in those years when the 
seasons are very much accelerated or retarded, will possibly, also, 
be found to differ somewhat from the particulars of this table, and 
differences due to latitude may likewise occasionally be noticed. 
This must, therefore, be taken merely as a general statement of 
the truth, subject to future correction; but understood with these 
limitations, it will be found useful for guidance in practical work. 
