24 IMPORTED PARASITES. 



shell (Fig. 3), and do not resume activity until the middle of 

 the following summer, ten months later. The transformations 

 to pupa (Fig. 4) and adult (Fig. 1) follow in the course of two 

 or three weeks, the latter emerge, and in a few days are ready 

 to deposit eggs for another generation within the newly deposited 

 eggs of the next generation of the gypsy moth. There is thus 

 but one generation of the parasite each year, and its life cycle, 

 which corresponds to the annual cycle, is correlated exactly with 

 that of the insect which serves as its host. 



It is a native of both Europe and Japan, and is sometimes 

 a common and effective parasite in either country. It is very 

 unevenly distributed, however, especially in Europe, and a great 

 many lots of eggs have been received which did not contain any 

 of the parasite. For two years large numbers of egg masses 

 were imported from various European and Japanese localities, 

 and not a single specimen was secured. Finally, in the spring 

 of 1908 it issued almost simultaneously from Russian and from 

 Japanese eggs, and was soon determined to be a primary 

 parasite. About 500 individuals were liberated that summer, 

 but under conditions which were unsatisfactory in many re- 

 spects, and no reproduction in the field resulted, so far as has 

 been determined. 



Encouraged by the knowledge that there was an egg parasite 

 which could be secured through the winter importation of eggs, 

 — a fact which was far from being established up to the rearing 

 of the first specimens of Anastatus, — larger importations from 

 numerous localities were made during the winter of 1908-09. 

 As before, only a part of these shipments were productive, but 

 among them was one consisting of five sacks of about 1,000 egg 

 masses each, from Professor Jablonowski of Budapest, which 

 were collected in five different Hungarian localities. From 

 three of these only an insignificant quantity of parasites was 

 secured, one lot being entirely unparasitized. From two, how- 

 ever, was secured by far the largest number of egg parasites 

 ever received from any source, there being more than 80,000 

 all told. It illustrates very well the uneven distribution of the 

 species in Europe. 



These, together with some others from other sources, were 

 liberated in five colonies, in quite widely separated localities 



