■437- 
All parasites were taken to the point of release, in the containers 
in which the;'' were packed for distribution at Poorest own, N, J., where all 
emergence was taken. Figure 1 shows the technique utilized in allowing 
tachinids to, escape from the shipping container. A similar technique was 
utilized with the Hymneoptera. 
In order to receive the maximum benefits from the parasite releases 
it is essential that these liberations be timed to synchronize the maximum 
oviposition period of the parasites.' with the optimum stage of host develop- 
ment to receive such ovipositions. A practical accomplishment of this 
synchronization is difficult for many reasons, as the following: (1) Spe- 
cific information is lacking concerning the length of life and oviposition 
period of various species of parasites under field conditions; (2) the ef- 
fect of seasonal variations in shifting the development of their host, the 
corn borer, under field .conditions, cannot be foretold; (3) since obviously 
it is impossible to vary, to any great extent the normal date of emergence 
of one species of internal parasite more than that of another after the 
host material has been placed in a developmental environment, this necessi- 
tates the selection for emergence that period Which is optimum for the 
most important species expected to emerge from the material at hand. 
However, all releases of corn borer parasites are timed to synchro- 
nize with the average first appearance of optimum host development, as 
this procedure has previously proved effective with releases; whereas, a 
number of past releases that have preceded or been delayed beyond this 
period have not proved successful. In planning the emergence schedule 
for 1935 > major emphasis was placed on accomplishing the desired synchro- 
nization with respect to two species, namely, Inareolata punctoria from 
the Italian host material, for synchronization with third-instar larvae 
in both the one- and two-generation areas, and Cremastus f lavoorbitalis 
from the oriental source, for synchronization with fourth-ins tar hosts 
in Canada. Fortunately, such factors as the demands of the different para- 
sites for varying host stages, on which to oviposit, variations in the 
length of the developmental period of the host, and the duration of the 
preoviposition period, permitted a fairly close synchronization of all 
parasites as well as those selected for chief consideration. 
The more pertinent information bearing on the accomplishments of 
the 1335 colonization program are presented in the following discussions: 
1. Inareolata punctoria Roman. (ichneumonidae): 
Major emphasis was placed on the optimum handling of this parasite, 
as it was the least widely distributed of the parasites that have been 
demonstrated to be the most valuable species imported to date. A total 
of 7 » 3^3 adults were released in 13 colonies, 12 of which were dispersion 
colonies and 1 a supporting test release at Milford, New Haven County, 
Conn. Table 3 summarizes the releases of this species and map 1 indicates 
the extent of colonization prior to 1935 > a^d the counties receiving re- 
leases during that season. 
