16 
BULLETIN" 1469, TJ. S. DEPARTMENT OF AGRICULTURE 
moth. Several of the insect enemies of the gipsy moth and the 
brown-tail moth which have been introduced and established are also 
enemies of the satin moth. 
Numerous observations have been made, and collections of various 
stages of the satin moth obtained, to determine the status of the 
natural control of this insect in New England. Absolute records 
have been obtained showing that Compsilura concinnata Meigen, 
Calosoma sycophanta L., and Blepharipa scutellata ~R. D. have 
attacked the satin-moth larvae in the field. These three introduced 
insects are among the most important enemies of the gipsy moth that 
have been successfully established. 
B. scutellata has not as yet been an important enemy of the satin 
moth, but the fact that it is able to develop as a satin-moth parasite 
gives it a potential value, and under certain conditions it may become 
important. 
Adults of Calosoma sycophanta are often seen climbing over the 
trees and feeding on satin-moth larva?. They attack these larvae 
readily, and the evidence of their work is often observed. Many 
satin-moth larvae which have been killed or injured by the beetles 
have been found on the tree trunks and on the ground at the base of 
the trees. The observations which have been made indicate that the 
Calosoma larvae appear too late in the season to be of primary im- 
portance as enemies of the satin-moth caterpillars. Moreover, the 
habit of many of the satin-moth larvae of pupating in partially 
folded leaves protects them still further from the attacks of Calosoma 
larvae. 
Table 1. — Parasitism of satin-moth larva? and pupce by Compsilura concinnata 
in New England from 1922 to 1924, as slioicn by rearing s 
Town 
Year 
Medium- 
sized 
larvae 
collected 
Comp- 
silura 
recovered 
Large- 
sized 
larvae 
collected 
Comp- 
silura 
recovered 
Pupse 
collected 
Comp- 
silura 
recovered 
Revere. ___..__._..___. . _ 
1922 
1923 
1924 
1922 
1923 
1924 
1922 
1923 
1924 
100 
100 
100 
100 
100 
100 
100 
100 
100 
1 

1 
12 
22 
2 
10 
6 
4 
100 
100 
100 
100 
100 
100 
100 
100 
100 
11 
7 
56 
44 
71 
66 
50 
63 
71 
100 
100 
100 
112 
100 
100 
100 
100 
100 

Do. _ 
3 
Do 
5 
16 
Do 
29 
Do 
35 
Medford - - 
16 
Do 
11 
Do. 

Up to the present time Compsilura concinnata has been the 
principal insect enemy of the satin moth in New England. Table 1 
shows the value of this introduced tachinid as an enemy of the 
satin moth. 
The data obtained during the summer of 1925 from collections of 
medium-sized and large caterpillars are presented in Table 2. 
The larval and pupal collections shown in Tables 1 and 2 were 
kept in trays at the laboratory, and were cared for until the emer- 
gence of the parasites. The recoveries from these collections 
indicate the abundance of C. concinnata, and distinctly show how 
readily it is attacking the satin moth, but these figures are not pre- 
sented to show the actual percentage of parasitism of the satin moth 
