Apr. 1, 1925 
Two Imported Egg Parasites of the Gipsy Moth 
667 
Anastatus were reared from gipsy-moth 
eggs collected in Russia and sent to the 
laboratory; a few came from Japanese 
eggs. In 1909 the Anastatus were 
colonized as mature larvae within the 
host eggs. Most of this material was 
received from Hungary, but it in¬ 
cluded about 5,000 Anastatus from 
J apan. 
298 towns are in Massachusetts, 169 
in New Hampshire, 97 in Maine, 35 
in Vermont, 32 in Rhode Island, and 
31 in Connecticut. The area which 
has been colonized by Anastatus is 
shown in Figure 10. No further 
colonization of Anastatus is necessary 
in 441 of these towns, so thoroughly 
has the work been done. In the other 
Table II .—Summary of the colonization of Anastatus bifasciatus 
Massachusetts 
New Hampshire 
Maine 
Rhode Island 
Colonies 
Individuals 
Colonies 
Individuals 
Colonies 
Individuals 
Colonies 
Individuals 
1908 
1 
5 
97 
160 
621 
851 
1,047 
6,877 
8,218 
1, 722 
645 
1,946, 
513 
128,180 
105,000 
227, 500 
621,000 
851,000 
1,047,000 
6,877,000 
8,227,000 
1,722,000 
645,000 
2, 111, 000 
1909 
1910 
1911 
26 
26,000 
1912 
1913 
571 
514 
1,501 
3,522 
4,376 
575 
6,130 
1,154 
571,000 
514,000 
1, 501,000 
3, 522,000 
4,376,000 
575,000 
6, 273,000 
1,214,000 
1914 
191 
813 
942 
1,357 
377 
1,479 
813,000 
942,000 
1,357,000 
377,000 
1,675,000 
191R 
1917_ 
573 
93 
69 
573,000 
93,000 
135,000 
1918 a .. 
1919_ 
1920 
1Q21 
2 
1,854 
333 
b 500,000 
3, 708, 000 
333,000 
1922_ 
408 
225 
816,000 
225,000 
121 
167 
242,000 
167,000 
129 
258,000 
1923_ 
Total - 
24,379 
27,103,193 
19, 002 
19,613,000 
5, 256 
5, 573,000 
864 
1,059,000 
Connecticut 
Vermont 
Total 
Colonies 
Individuals 
Colonies 
Individuals 
Colonies 
Individuals 
1908 
1 
5 
97 
186 
621 
1,422 
1,561 
9,191 
12,682 
8,079 
1,745 
9, 768 
1,154 
2 
2,783 
930 
513 
128,180 
105,000 
253,500 
621,000 
1,422,000 
1, 561,000 
9,191,000 
12,691,000 
8, 079,000 
1,745,000 
10,338,000 
1,214,000 
500,000 
5, 566,000 
930,000 
1909 _ 
1910 
1911 
1912 , . 
1913 
1914 
1915 
1916 -- - 
1917 
51 
55 
144 
51,000 
55,000 
144,000 
1918 « _ 
1919 
1920 _ 
1921 __ _ 
1922___ 
215 
200 
430,000 
200,000 
56 
5 
112,000 
5,000 
1923 _ 
Total__ 
665 
880,000 
61 
117,000 
50, 227 
54,345,193 
a Enough eggs of the gipsy moth were collected this year to obtain from them 8,000,000 Anastatus. Th e 
winter of 1917-18 was very severe, with heavy mortality of both host and parasite. 
b Estimated. The greater part of the material was used for a large reproduction experiment. 
Table II presents statistics of the 
yearly colonization. Since 1909 all 
Anastatus which have been liberated 
have been obtained by collecting 
gipsy-moth eggs in New England. 
As a rule, each colony has contained 
1,000 Anastatus. They have been 
put out as full-grown larvae within 
the gipsy-moth eggs. 
Over 54,000,000 Anastatus have 
been liberated in New England, dis¬ 
tributed over 662 towns. Of these, 
221 towns the colonies were liberated 
rather sparsely, as the gipsy-moth in¬ 
festations at the time of colonization 
were light and scattering. It will be 
necessary to place more colonies of 
Anastatus in many of the partially 
colonized towns. 
During the winter months the Ana¬ 
status which are to be colonized in the 
spring are gathered from the field, in 
the gipsy-moth eggs. After separat¬ 
ing the parasitized from the health 
