282 SWAINSON’S BUZZARD. 
from those places where it is known to exist. If, after taking the 
preliminary steps, as described in a former part of this article, we 
should find, after the lapse of the necessary time, upon the trees” 
mark the exit of the chalcis, we should know that the friend 
parasite had entered upon its work. If such an experiment could 
be conducted to a successful issue, it would furnish one of the 
most admirable instances on record, of the triumph of science, in 
be 
its application to economic entomology.’” 
In like manner the Hessian fly and wheat midge could, we 
believe, be kept within legitimate bounds, by the transportation 
from Europe of the parasites that in England and France are 
known to reduce their numbers materially. It would be an easy 
task to cause several bags of stubble containing the 
of these parasites to be sent over to this country, and reared. | 
here. So also the dreaded cabbage butterfly, our last, European — 
importation, can in new districts be kept under by transporting: 
the Pteromalus or chalcis parasite, which in Essex county, Massy 
is quite abundant. This rearing of ichneumon parasites can be 
carried on by intelligent gardeners and farmers in conjunction 
with an entomologist, and we look upon the future of ichneumon 
culture as one of the departments of a scientific, intelligent agri- 
culture. Something should be done in the matter by the nati 
department of agriculture, and instead of disseminating frig 
fully injurious insects in the seeds distributed from Washington, 
as is sometimes done through carelessness, it would be less harm- 
ful to scatter broadcast papers of ichneumon seed. 
HABITS AND CHARACTERISTICS OF SWAINSON’S 
: BUZZARD. | 
BY DR. ELLIOTT COUES, U. 8. A. 
' 1873, Excepting an occasional rough-leg or red-tail, it was th 
ily buteonine® species observed, and the only haw 
a mon were the ubiquitous marsh harriers and sparrow-haw 
Bachan ği 
