606 THE WHITE COFFEE-LEAF MINER. 
and killed. Or the sides of such an apartment could be made of 
gauze, fine enough not to allow the passage of tlte moths, but yet 
large enough to let the parasites out. ` Such a building could be 
placed in the midst of a plantation. I believe that eventually we 
shall have to rely mainly upon such indirect measures as & pro- 
tection for our crops. It might even be worth while to undertake 
a positive cultivation of the parasites, at least at those times when 
the race has greatly diminished in numbers. It has often been 
observed, in studying the history of those insects which are sub- 
jected to unnatural conditions by man’s cultivation of the ground, 
that there is an alternation of years or of series of years in which 
the insects are found to be very destructive, or to have almost 
entirely disappeared. These alternations are partly due to the 
influence of the seasons, but largely to the attacks of other insects. 
At first the destructive insects are found to be very numerous, but 
an examination will show that they have already been attacked by 
parasites which kill them, while the parasites themselves develop. 
This process goes on until the parasites have so far outnumbered 
their prey as nearly to exterminate them, when they will no longe 
be able to find food, and will themselves perish. Then once more 
the destructive insects will have an opportunity to multiply, and 0 
the rotation will be continued. Now it is at the time when the dt 
structive insects have been reduced to the smallest numbers that the 
enlightened agriculturist will find it most practicable to adopt such 
measures that their numbers may never again increase. Knowing 
how rapidly these insects increase, when not held in control by y 
forces of nature, he will feel that every effort of his to stop ue 
the first step will be an investment of labor at compound interest 
for a long time to come. Who then would count the trouble? ed 
he must know what to do. a. 
P.S.—I desire to correct an error in the former part of this biT : reat : 
pointed out to me by Mr. V. T. Chambers, of Covington, Kentucky, 07 =" d 
volume of the A N . On p.338, I said that C. caffedlnn 
£ 1: Sh, F 
the only p i fth g ae taia th f urope : 7 
While I was in Brazil, Mr. Chambers described in the Canadian Entomolog! 
p. 23-25, a species from the United States, called C. albella. wrong. | x 
As all but one of Mr. Chambers’ references, in his note of ont a 
a : é ; thers. of the g% ge 
must, in order to be able to compare his species with the 0 abe the silvery 
i angle. If 
spot of the fore wings as apical, instead of at th = than 
sition is correct, C. albellum seems more nearly related to C: aaa 
t at the inner 
other species, but may be known from it by having the spo as 
fore wings silvery gray metallic, with very distinct black mar 
