-131- 
Dexia ventralis . — This parasite was colonized at intervals "between 
the years 1926 to 1938, during which time 15,254 individual parasites 
were distributed in l4 colonies. Though 5 States were selected, repres- 
enting a varied number of habitats, only 1 colony at Heddonfield, IT. J., 
has ever, been recovered; this colony seems to sustain itself feebly* 
The species has 3 broods per year, with the second or summer brood emerg- 
ing at a time when Japanese beetle larvae are very scarce. It was thought 
that, as the species is not specific in host selection, it v/ould do well 
in areas where native Phyllopliaga larvae could act as alternate hosts; how- 
ever, attempts to establish it in such areas have thus far proved unsuccess- 
ful. The distribution of releasements by States is as follows: Now Jersey, 
3; Pennsylvania, 5? Illinois, 4; Maryland, 1; New York, (Long Island), 1. 
Prosena sibirita .—This parasite of Japanese beetle larvae hp„s been 
released in numbers totaling 12,364 individuals, distributed in varying 
numbers in 5 releasements between 1923 and 1930* Only 1 colony in the 
Moorestown, N. J., area is known to be established. No recent coloniza- 
tion of the species has been undertaken. In Japan, its native habitat, 
the parasite is most numerous in areas where Popillia has a partial 2- 
year life cycle. The species seems to be of little value in the United 
States at the present time, although as yet no area, in the infested por- 
tions of this country has been found where there is definite evidence of 
2-year life cycle of the host. 
