78 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
correlated with the largely two year cycle of the host. At Koiwai, 
where the beetle is fairly abundant each year, the parasitism ranges 
from 75 to over 90 per cent, as based on four years observations. Dur¬ 
ing the past three seasons a total of 296,000 parasitized beetles have 
been collected, as many as 56,000 having been secured in a single day, 
and the puparia from these shioped to New Jersey. 
Ochromeigenia ormioides is found more or less commonly only in the 
warmer sections, particularly at Yokohama, where in 1922 a parasitism 
of approximately 35 per cent was secured. Unlike Centeter , this 
Tachinid is nocturnal, deposits living larvae rather than eggs, and has a 
life cycle of about 20 days, thus permitting nearly three full generations 
per year. This parasite was originally described from Java, and has 
since been found also in western China, Manchuria and Korea. It 
attacks several species of Anomala as well as Popillia. A number of 
shipments have been made, but thus far without success. 
The third Tachinid upon adults, Eutrixa sp. was first secured during 
the past season from a shipment of C. cinerea material forwarded to the 
Riverton laboratory in 1922. It is comparatively rare, and of much 
less value in Japan than either of the previously mentioned species. 
Of the parasites of Popillia grubs in Japan 3 species were found, one 
being a Dexiid fly and the remaining two of the Scoliid genus Tiphia. 
One of the latter occurs at Yokohama during July and early August and 
has not been considered for importation, due to its unfavorable time of 
appearance. The second was found abundantly only at Koiwai, 
where a field parasitism of about 20 per cent was effected during late 
August and early September. Shipments of reared cocoons totaling 
3,350 have thus far been sent over. 
The Dexiid parasite (Prosena siberita Fabr.) occurs commonly through¬ 
out Japan and in Korea as well, and effects a field parasitism of approx¬ 
imately 10 per cent. This species deposits its larvae on the surface of the 
soil, and these burrow about in search of grubs within which to develop. 
One generation per year is produced. Shipments of parasitized grubs 
totaling 10,600 have thus far been forwarded to New Jersey. A poten¬ 
tial rate of increase of 500 fold per year, in addition to a high degree of 
adaptability as regards climatic and soil conditions, would indicate the 
possibility of greater effectiveness under American conditions. 
Only one predator has been considered for importation, this being a 
Carabid ( Craspedonotus tibialis) .which was found abundantly in certain 
sandy regions. Some 17,000 adults of this species were collected and 
