- 534 - 
. T 
field conditions and, consequently, that releases should he mo.de to coincide 
with the start of host oviposition. The first releases of this parasite were 
mo.de on the afternoon of June 4 o.nd the first host eggs we re found in the 
field the following morning. Releases continued (in the Hudson River Valley) 
until June l6 hy which date the x^enk of host egg deposition had been reached, 
hut Large numbers of corn borer eggs were still being deposited nightly. The 
sme,ll number of releases in other localities were also well synchronized with 
the presence of host eggs. 
The 109,213 adults of C_. annul ipes releoned in the Hudson River Valley 
were reared at the Toledo, Ohio, corn borer laboratory, Ephestia kuehniella 
Zell, being utilized as a host for this purTjose. Ohelonus adults for the re-" 
lease in Ohio were also from this source. The adults of this j)arasite releas 
in Hew Jersey were obtained incidental to the domestic x^rocuremcnt of Macro- 
centrus gifuensis. Table 1 lists the relee.ses of C. annulipes made during 
19~4o7 
Thirty-nine releases, totaling . 78,072 adults, of the polyembryonic 
braconid Me.crocentrus gifuensis were made during the 1940 season. This para- 
site was released on a county basis, in most cases limited to 1 colony of 
apioroximately 2,000 adults, inclusive of both sexes, x^cr county. All 8 
counties in Connecticut received liberations of this parasite. In Mass a-- ' 
chusetts releases were made in 6 of the 11 counties in which this parasite is 
not known to be established* The 3 counties in Rhode Island in which this 
parasite is not found or is scarce, received releases. In eastern Hew York 
10 counties, including Suffolk County, Long Island, as well as counties in th 
Hudson River Valloy, received releases, and extra releases were na.de in 
Columbia and Rensselaer Counties where the borer has recently been . particular* 
abundant. In Hew Jersey 8 counties received releases of this parasite, in- 
cluding most of the counties in this State not previously colonized in which 
borers have been destructive. Ho releases of this parasite were made south 0 
Hew Jersey, owing to the comparatively low populations of the host at the tin 
releases were made at the other points. 
One retest release of M. gifuensis was made in Adams Township, Lucas 
County, Ohio, where a multiple-generation strain of the borer is now building 
up in a locality in which the borer was previously limited to a single-genera* 
tion cycle. It is believed all releases of M. gifuensis accomplished during 
the 1940 season were synchronized with host presence in stages favorable to 
attack by this parasite. ■ 
All M. gifuensis adults released wore reared at the Moorestown, H. J., 
corn borer laboratory from host material collected in. southeastern Massa- 
chusetts in the fall of 1939* This imported -parasite ha.s increased to such 
an extent in that locality that, so far as known, it is now more abundant the- 
than in any European or Oriental country from which it was first in-ported. 
Table 2 lists the releases of M. gifuensis hade in the United States during 
1940. 
The adults of Chelonus annulipes , which were reared at Toledo, Ohio, wer 
shipped from that city by railway express utilizing ice-cooled., insulated 
