12 
BULLETIN 204, U. S. DEPARTMENT OF AGRICULTURE. 
As a result of the Calosoma scouting work carried on during July 
and August, 1914, it has been found that this species exists in 18 towns 
in Maine, 93 in New Hampshire, 1 70 in Massachusetts, 3 in Rhode Island, 
and 2 in Connecticut. Data concerning this insect obtained during the 
present year indicate that the species is able to maintain itself in con- 
siderable numbers in areas where the gipsy-moth infestation is slight 
and that as a rule the species continues to be abundant after it once 
becomes established in a locality. Owing to the well-known habits 
of the beetles in migrating considerable distances, it was thought 
that territory with light infestation would be deserted in favor of 
areas where caterpillars occurred in abundance. This does not prove 
to be the case and it is another feature which increases the value of 
this beneficial insect. 
The table below shows the colonization of the principal parasites 
during 1913 and 1914: 
Tablk II. — Colonization of natural enemies in 1913 and 1914- 
Species. 
Number of colonies 
liberated. 
Number of individuals 
liberated. 
Towns where colo- 
nies were placed. 
1913 
1914 
1913 
1914 
1913 
1914 
1.500 
110 
56 
10 
45 
1,561 
502 
14 
28 
49 
1,500,000 
352,000 
76,000 
4,565 
6,175 
1,. 561, 000 
2,083,254 
13,119 
23,638 
8,104 
2 42 
33 
48 
10 
42 
15 
111 
14 
26 
38 
i A part of the collections and colonization were made by cooperative arrangements with the State officials 
of Maine and New Hampshire, with the Dominion Entomologist of Canada, and with Mr. F. M. Webster 
of this bureau. 
2 In many of these towns only a few colonies were liberated. 
The results of the work accomplished by introduced parasites of 
the gipsy moth during the past year have been excellent. It is true 
that the increase of Apanteles lacteicolor has been seriously retarded 
but the other species have given a good account of themselves. The 
fact that Compsilura and Calosoma are becoming established hi the 
remote parts of the area infested with the gipsy moth and are able 
to maintain themselves under these conditions is very encouraging, 
as the work of these species will tend to reduce the infestation and 
be an important factor in preventing the spread along the outside 
border. 
WILT-DISEASE INVESTIGATIONS. 
In connection with the parasite work and having a distinct influence 
on the increase of the gipsy moth in the field, an elaborate series of 
experiments has been conducted by Mr. R. W. Glaser and several 
assistants for the purpose of securing information on the identity 
of the wilt disease (PL VIII) and the factors which are favorable to 
its increase in the field. 
