As the 1936 surveys showed. Macrocentrus gifuensis at "both Dighton and 
Bridgewater with indications that it was probably present in the territory 
between these points, as Cholonus annul ipes was believed to be present 
beyond the area surveyed in 193& » and as the indications were that Lydella 
grisescens and Inareolata punctoria were dispersed over a considerable 
area, a survey of a territory 45 miles in diameter, covering an area of 
1,595 square miles, extending from just south of Boston, Mass., to and in- 
cluding Frovidence, R. I., was surveyed in the fall of 1937* This terri- 
tory covered almost all of southeastern Massachusetts, except Cape Cod 
east of the canal, as well as a part of Rhode Island, and included the 
districts previously surveyed separately at Bridgewater, Dighton, Taunton, 
and Swansea, Mass,, and East Providence, R. I. 
The Taunton region, as outlined above, was surveyed in 1937 by 
utilizing a polar coordinate design centering at Taunton, Mass. The percen- 
tage of parasitization of the borer by the exotic .parasite complex, con- 
sisting of Inareolat a puncto ria, Lydella grisescen s, Macrocentrus gifuensis , 
arid Chelonus annul ipes , decreased as the distance from the center of the 
survey increased. Rot only was this true of the introduced parasite com- 
plex as a whole, but it was also the case with each of the four principal 
parasites making up that complex. Cremastus flavoorbitalis , although an 
introduced parasite present in this area, is still too scarce to be of 
importance in the parasite complex of this area. Sufficient time has not 
elapsed since the establishment of the parasite colonies at the remaining 
points surveyed in 1937 i* 1 the eastern area to allow comparative yearly 
studies of the parasite complex. 
Summary 
Surveys conducted at the close of the 1937 season showed that in the 
Lake States area the parasite of first importance was Lydella stabulans 
grisescens . It was abundant near the marshland at the southwestern shore 
of Lake Erie, and in this region parP.sitiza.tlon of over 60 percent in some 
samples of borers was noted. 
In the eastern area the most important parasite complex centered at 
Taunton, Mass,, in which region five species of imported parasites predomi- 
nated. These were Lydella stabulans gris escens , Macrocentrus gifuensis, 
Chelonus annul ipes , Inar eo lata punctoria , and Cremastus" f lavoorbl ta l i s~7 
listod in order of their oif ectivoness, L. grisescens assuming first placo 
bocause of its more general distribution? 
The highest parasitization in individual fields was by C. annulipes. 
In the vicinity of the oldest release points in the United States, center- 
ing at Malden, Mass,, Inareolata punctoria was of first importance. The 
pupal parasite Phaoogenes nigr idens was recovered at several points in the 
Malden area. 
Exceptionally high parasitization by Ina reolata. punctoria was noted at 
the comparatively recently established liberation point near E. Hartford, Conn. 
ghelonus annulipes was recovered in the Lee district in Virginia, but 
at this point, as well as in the Atlantic, N. J., district, parasitization 
was low. 
