PARASITISM OF (ilPSV MOTH IN AMERICA. 
141 
Undetermined Tachinids. 
Dr. S. W. Williston. in reporting upon a collection of Diptera reared 
fioin the gipsy moth in Massachusetts and sent to him in 1S<)1 by 
Dr. Fernald. stated that there were present two species of Exorista 
and four of Phorocera. Unfortunately these specimens appear to 
have been lost before being definitely determined. No such variety 
of tachinids lias been reared from this host in Massachusetts during 
recent years, but several species as yet undetermined, or represented 
only by unfamiliar puparia, are in our collection. 
SUMMARY OF REARING WORK CARRIED ON AT THE LABORATORY IN 
1910. 
Iii Tables IV and V are t ho condensed results of a pari of an 
extensive series of rearing experiments primarily instituted for the 
purpose of determining the present status of the introduced parasites 
of the gipsy moth in America in 1910. They also serve excellently 
as an indication of the effectiveness of parasitism by native species. 
In this respect they are typical of the results secured from similar 
work in previous years! 
Table IV.— Results of rearing work in 1910 to detennim progress of ini ported parasites 
and pre rah nee of parasitism hg natin parasites of gi jtsg-ntoth pa pit 
LillMH 
raton 
No. 
Localities. 
Niim- 
bec of 
<liv|»ar. 
pupa-. 
Mot h i reared 
Parasites reared. 
Scano- 
phagid 
puparia. 
Male. 
l-'rliiale. 
Blepha- 
r.pa MO- 
tellata. 
2 
1 
2 
The- 
ronia 
tahrflB- 
ceius. 
Camp* 
silura 
Bonoto- 
nata. 
MlM-l- 
laneous 
tachi- 
nids. 
2185 
2188 
2187 
21S* 
•21 VI 
2190 
2190a 
North A lit lover. . . 
Melrose 
1,700 
500 
1.S00 
I, MX) 
1.000 
SOD 
i 106 
800 
300 
2>2 
100 
1,060 
1.700 
1.047 
1.(100 
1.000 
1,250 
580 
1.700 
500 
400 
1.700 
000 
300 
1.000 
1.100 
900 
500 
500 
1,100 
1.222 
IV, 
tifCi 
|S2 
412 
1215 
4 
159 
108 
09 
87 
274 
312 
379 
81 
147 
2.-.:; 
212 
442 
201 
152 
354 
82 
85 
143 
118 
198 
229 
8L 
193 
259 
l.Vt 
21 * l 
401 
250 
217 
3S 
t,s 
92 
115 
22 
172 
211 
127 
144 
7s 
209 
102 
218 
125 
133 
340 
87 
49 
401 
323 
215 
102 
104 
156 
North Andover. . . 
stoneham 
3 
5 
2 
1 
2 
2 
Sauna 
3 
1 
Y\ akefield 
do 
1 
1 12 
2191 
2192A 
219211 
2192C 
2193 
2194 
2190 
2197 
219*) 
22X0 
2281 
2282 
2283 
22.s 1 
22V> 
22NO 
22S7 
2289 
2290 
2291 
2293 
2294 
2295 
North Andover. . 
Wohnrn 
1 
North Andover.. . 
Saugus 
2 
1 
Melrose - 
1 
Stoneham 
Beverly 
I 
13 
5 
10 
do 
2 
2 
1 
17 
1 
Saugus 
1 
3 1 
North Andover... 
do 
Beverly 
8 
* 1 


do 
Gloucester 
3 
52 
5 
1 
Beverly 
do 
North Andover. .. 
do 
do 
3 
4 
1 
2 
Beverly 
do 
: 
2 
2 
Middleton 
Total 
27.215 
7.531 
| 5.342 16 
47 
18 
4 
53 
1 1 're pupa?. 
2 l'artly from another locality. 
3 Tachiua-like species, puparium. 
* Exorista blanda. 
5 Onetachina-likeandone unknownnativespecies, 
puparia. 
