142 
PARASITES OF GIPSY AND BROWN-TAIL MOTHS. 
Table IV includes the results of rearing work in which caterpil- 
lars collected in the open were used. A large proportion of the 
collections, probably half or more, was from localities in which 
Compsilura concinnata is not as yet established, although it will 
probably have extended its range to include these by the end of 
another year. It will be observed, however, that the number of the 
Compsilura reared is very far in excess of that of any native tachinid 
or other parasites attacking this caterpillar as a host. This is espe- 
cially encouraging in view of the fact that one year ago less than 
one one-hundredth of the proportionate number of Compsilura were 
reared under similar circumstances, and only from material collected 
over a much more restricted area. 
Table V.— Results of rearing icork in 1910 to determine -progress of im ported parasites 
and prevalence of parasitism by native parasites of gipsy-moth caterpillars. 
Laboratory No. 
Localities. 
Number of caterpillars. 
Number of p up ae 
reared. 
Number 
of moths 
reared. 
Number of parasites reared. 
03 
"31 
Female. 
2 * 
- 03 
S 
P 
O o 
O o 
PI - 
%M 
03 ._ 
03 1 * 
o § = 
03 . 
— \r. 
- | 
O p 
— a 
Blepharipa 
scutellata. 
4317 
4330 
4332 
4333 
4334 
43.37 
4340 
Welleslev 
1.029 
535 
2.110 
3.000 
2.000 
800 
1.250 
600 
2. 000 
300 
100 
1,500 
125 
110 
1.000 
1.125 
500 
230 
400 
1.000 
250 
800 
150 
150 
425 
300 
100 
53 
341 
158 
298 
716 
962 
599 
300 
846 
308 
902 
234 
54 
566 
69 
14 
818 
934 
207 
56 
"20 
338 
61 
286 
103 
65 
181 
191 
37 
6 
281 
15 
43 
419 
371 
59 
20 
234 
124 
363 
18 
5 
30 
1 
245 
150 
11 
4 
1 
29 
4 
21 
11 
9 
29 
18 
2 
13 
81 
115 
177 
88 
245 
144 
317 
202 
34 
199 
25 
6 
344 
301 
125 
30 
5 
139 
22 
106 
43 
11 
lit 
128 
22 
4 
42 
Stoneham 
9 
Welleslev 
8 
4 
do 
Stoneham 
108 
73 
do 
Welleslev 
3 
4341 
. 4349 
Swampscott 
1 
6 
2 1 
4351 A 
4351b 
4352 
4353 
4354 
4356 
4359 
4360 
4362 
4366 
4367 
4369 
4370 
4372 
4373 
4377 
4378 
4386 
4387 
4392 
Medford 
6 
Winchester 
Dan vers 
6 
2 
12 
Winchester 
1 
Wellesley 
2 
1 
1 
2 3 
38 
34 
do 
Stoneham (?)... . 
Beverly 
59 
1 
1 
Lexington 
2 
15 
5 
14 
21 
Salem 
Marblehead 
Salem 
. 
31 
Stoneham - 
Woburn 
Welleslev 
3 1 
Xahant 
1 
1 
1 
1 
Winthrop 
Burlington 
Lexington 
Manchester 
21 
Total 
22. 283 
9.610 
337 
25 
2 
*! 14 
1 
1 The identity of this tachinid, the puparia of which resemble those of tachina, but which hibernates as a 
pupa, is wholly unknown. The adult has never been reared. 
2 From near site of colony of 1910. Recovery of no significance. Masses of cocoons counted. 
3 A few pupae included in this collection. 
In Table Y arc included results of rearing work in which collections 
of gipsy-moth pupffi were used. These were largely made in local- 
ities near the center of colonization of BlepTwbripa SCUteUata of the 
same year. The number of Blepharipa secured is higher in propor- 
