Cremastus flavo orbital is (Cameron) . — This species was again recovered 
from one section of the Taunton area, ahowing .its continued maintenance 
there, hut it has. failed to- increase to sufficient numbers to he recovered 
outside of a very restricted district. However, the collection from which 
this parasite was reared was made about 4 miles from the site where it was 
taken in, 1936. , 
Phaeogenes nigridens Wesm . — A survey conducted during 'the summer of. 
1938 to determine. the status of P. nigridens in eastern Massachusetts show- 
ed this imported, pupal parasite to ho present over an area of about’ 10 
square miles. Collections in which the parasite appeared were made in two 
districts, one lying in the vicinity of Waltham, Arlington, and Lexington 
and the other near West Peabody and Danvers. One collection showed a 
parasitization of over 10 percent, 
Native paras i te s . —Pour species of native parasites, Panzeria peni tai ls 
Coq. , Zenillla caesar Aid. , Labrorychus prismaticus Nort. , and Bassus agiils 
Cress., were recovered in the 1937 surveys . In no instanco did the parasiti- 
zation by any of these parasites average over 1 percent. 
Parasite Status at Two Release Points in the Eastern Area 
The Malden, Mass., area .— The parasite complex at Malden, the center 
of several of the oldest release points in the United States, is made up 
chiefly of two parasite species, Inareolata punctoria and Lydolla grises- 
cens, both introduced into the United States from Europe and the Orient, 
Table 4 gives a comparison of the percentages of corn borer parasitization 
by exotic species for comparable districts of the Malden area for the per- 
iod 1927-37. inclusive. 
Table 4.— Corn-borer parasitization in a comparable portion of the Malden . 
Maas. 1927-37. inclusive 
i t • f ' J r ‘ " 
Year 
Parasitization 
Year 
Parasitization 
Percent 
•• 
Percent 
1927 
2.79 
hL933- 
no data 
1928- 
5.17 
:&934 
14,53 
1929 
6.87 
»1935 
16.11 
I93O 
9.67 
::19 3 6 
14.05 
1931- 
9.87 
•0 Oil 
9.66 
1932 
15.16 
** 
0 
It may be noted from table 4 that there was a steady increase in 
parasitization of the borer from 1927 to 1932 and that for the period 1932 
to 1936, inclusive, this remained more or loss static at approximately 15 
percent. At the close of 1937 parasitization was considerably below that 
for the previous 5 years and was no higher than in 1930. Data at hand indi- 
cate that the reduction in the population of parasites, as compared to host 
abundance, took place between the time of the 1936 survey in November of 
that year and a 1937 summer survey late in July and early in August. The 
