"530- 
in the territory .southwest o.f the. city of Hartford, 
L. grisescens was found to he well established at Atlantic, Monmouth 
County, and Brick, Ocean County, N, At the Burlington, N. J., parasite 
release point it vans found to he well estrhlishod and spreading rapidly from 
the point where a small number of the adults were first released in 1939* 
In Virginia, L. g r iso scans had not increased in 1939 "but continued to he 
the only exotic parasite of the borer present in that region. The average 
parasitiza,tion hy this parasite was 7 percent at Lee Township, Accomac 
County, and 1,4 percent at Franktown Township, Northampton County, both loca- 
tions on the Eastern Shore, 
Eulophus viridulus Thoms .:, — This eetophagous chalcid, which was recovered in 
193S in the Lake States for the first time in the United States, was taken at 
several new points in 1939* A number of these points had been examined prina: 
ily to determine the extent to which B. viridulus had become established and 
the current examination constituted the first observations that had been na.de 
for several years. Therefore, at such points it is not definitely known in 
what year the parasite reached a density measurable by the means utilized, A< 
one point, however, Perkins Township, Erie County, Ohio, at which the parasite 
had been released in 1931 and 1932, examinations have been made annually but 
no recoveries -had been made prior to 1939* It is evident, therefore, that E. 
viridulus remained on 0. maintenance basis for a number of years at such low 
concentrations that it was not recovered by the means utilized. An examina- 
tion of eight of tho points in the Lake States area, at which this parasite 
had been released showed it to bo established at six. Further evidence that 
the parasite had extended its range without grea.tly increasing in density at 
any point, is furnished by miscellaneous recoveries in the' summer of 1939. 
During surveys to determine the field status of the corn borer, a colony was 
taken at Swan ton, Ohio, about 20 miles southwest of tho nearest relca.sc point, 
and another in Wyandotte County, about 19 miles southeast of the nearest re- 
lease point at Marion Township, Hancock County, Ohio. E, viridulus was not 
recovered at any of the points in the eastern area* 
Ina.reola.ta. jjunctoria Roman .: — This ichneumonid p.ccounted for more mortality oi 
borers at the po inks survey e d in the ea.stern area than any other parasite,; I< 
was reared from 35 the 36 collections taken in Middlesex County, Mass,, ant 1 
showed an average parasitization of 10.6 percent with 23.9 percent of the 
borers in 1 collection being parasitized. 
At the Hartford, Conn,, survey district, pn.ra.si tizat ion of the borer by 
I_. punctoria averaged l4.1 percent in the territory within 1 l/2 miles of the 
release point. From this central portion to the perimeter of the survey, 
parasitization of the borer by this ichneumonid gradually decreased and in 
the outer ring, 1 mile wide and 6 l/2 miles from the release point, para.sitiz? 
tion was only 4.1 percent. In general, the rate of parasitization decreased 
as the distance from the point., of relea.se increased. However, I_, punctoria w 
roared from all but three of the collections made in the outer portion of the 
surveyed area and this . fact plus the parasitization (4,1 percent) at the oute* 
limits of the surveyed territory indicates tha.t this parasite is present be- 
yond the limits of its distribution as shown on map 2, 
