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the Orient, and a supply of Che 1 onus annul ipes Tfesn. bred in the laboratory 
at Belleville, Ontario. The last -mentioned species was shipped from ~ 
direct to the point of liberation, but all other material was handled at 
the l.Ioorestcwn, IT. J., laboratory and shipments were made from that point 
for distribution. The total releases of corn borer parasites made during 
1935 in the United States are summarized by States in table 1. The total 
releases to December 31, 1936, are given in table 2. The method of select- 
ing colony sites, technique in making releases, colony sizes, etc., were 
essentially the same in 1936 as in previous years. Information regarding 
the species released in 1936 follows. 
I. punctoria (ichneumonida e) . — As shown in map 1, a considerable 
portion of the area infested by the borer was colonized by this species in 
1935. Since further extension of this area was the chief objective of the 
1936 program, major emphasis was placed on the handling of the host larvae 
to insure its distribution to field localities under conditions optimum for 
its establishment, particularly as regards synchronization with the appear- 
ance in the field cf the preferred stage of its host. The extent of addi- 
tional distribution of Inareolata during the season is shown on map 1. A 
total of 14,271 adults were released in 25 colonies. Three of these were 
at test-colony sites in New Jersey and Virginia, thereby providing an oppor- 
tunity for observation on the reaction of this species to new environments. 
Table 3 summarizes the releases of this species in 1935. In most instances 
satisfactory synchronization of releases of this species with its preferred 
host stage was achieved. The first adults to emerge from material manipu- 
lated to supply adults for the multiple-generation area were released in lo- 
calities of most advanced borer development and the adults that appeared 
later were used for colonies located farther north. Under actual conditions 
experienced during the current season it is probable that a slightly more ad- 
vanced emergence period would have been desirable. In the one-generation area 
synchronization of releases with the presence of preferred host stages, as 
determined by observation at various field stations, was accomplished satis- 
factorily. 
I.l- tibialis (Brac onidae 1 ) . — It was desired to test this species in areas 
characterized by environmental conditions that might be more favorable to its 
successful establishment than those encountered at points of previous release. 
Synchronization of releases with the presenoe of the parasite's preferred host 
stage (second-instar larvae) was accomplished at all localities. This may be 
effected with Microgaster by manipulating the cocoons, in which stage the 
material hibernates and is imported. Observations of host development during 
the current season indicate when the optimum period will prevail for releases. 
The cocoons are removed from storage and placed in a developmental environment 
at the proper time to induce adults to emerge to conform to the host require- 
ments at the various proposed localities of release. Table 4 summarizes the 
releases of this species. 
L. stabulans var. gris es cens (Tachinidae) . — A supply of this id, 
derived both from domestic sources and the Orient, was released at two disper- 
sion points. 9ne colony of 1,965 individuals from the Orient was liberated in 
Miles Township, Centre County, Pa., on July 10. The second colony .-•■.■ released 
in Newark Township, Worcester County, Md, .This colony, consisting of 5,365 
adults from the domestic source, was r sed in two lots, one of 1,534 on June 
8, and one of 3,731 on July 3. Two small lots of domestic adults (one of 215 
