6 BULLETIN 766, U. S. DEPARTMENT OF AGRICULTURE. 
IMPCRTATIONS TO UNITED STATES. 
Compsilura was first imported into the United States in 1906, 
though it was not determined as such, being included in the gen- 
eral classification of Tachinidae. In 1907, from shipments of 
brown-tail moth larve and gipsy moth larve and pupe there were 
secured 104 puparia which were determined as Compsilura con- 
cinnata. These came from France, Germany, and Austria. Most 
of the Compsilura imported in 1907 were found free in: the boxes 
of brown-tail moth larvee, and a few in the gipsy moth shipments. 
In 1908 an experiment was tried in shipping live puparia from 
Europe to Melrose Highlands, Mass., but it was not successful, as 
the puparia were nearly all broken. That year 220. Compsilura 
were received. The year 1909 was the banner year in importations 
of Compsilura, a total of 6,626 being secured from foreign shipments, 
about 50 per cent of these coming from gipsy-moth material. This 
was the first time that Compsilura was accepted as more than an 
occasional parasite of Porthetria dispar. During the year 1910 the 
majority of the 1,859 Compsilura received were secured from gipsy- 
moth shipments in the late larva and early pupa stages. No puparia 
shipped as such were received, as those sent the previous year came 
in such poor condition. The season of 1911 was the last during 
which Compsilura was imported. In this year 1,233 were received, — 
about 75 of which came as puparia, practically all of the others 
being secured from brown-tail moth shipments. In the period be- 
tween 1906 and 1911 Compsilura was received from nine European 
countries as well as a few possibly from Japan, a grand total of 
10,042 being received at the Gipsy Moth Laboratory. _ 
COLONIZATION. 
There is no record of the number of Compsilura colonized in 1906 
or 1907, but in Bulletin 91 of the Bureau of Entomology, page 220, 
reference is made to efforts along this line. 
In 1907 a large colony was liberated at the location of one of the 
colonies of 1906, in the town of Saugus, Mass. No colonization was 
attempted in 1908, but in 1909 several colonies were established 
throughout eastern Massachusetts in the gipsy-moth area. Very 
little colonization was done in 1910 and 1911, a total of 1,304 being 
colonized during that time. It was in 1910 that a colony of this 
parasite was put out in Washington, D. C., to combat the white- 
marked tussock moth (J7emerocampa leucostigma S. & A.). In 1912 
colonization of Compsilura in New England was again resumed on 
a larger scale than at any previous time, and this has been continued 
until the entire gypsy-moth area has been covered. This parasite 
does not appear to be so firmly established in the brown-ta:l moth 
