20 
BULLETIN 1429, U. S. DEPARTMENT OF AGRICULTURE 
indistinguishable from those of Centeter, or produces living larvae 
as does Ochromeigenia, is not known. 
The life cycle apparently corresponds closely to that of Centeter, 
only one generation a year being produced. 
PROSENA SIBERITA Fabricius 
GENERAL OBSERVATIONS 
As in the case of Centeter cinerea and Tijphia popilliavora, the first 
trace of parasitism by this species upon Popillia japonica was obtained 
at Koiwai, this being in early August, 1921, when four grubs were 
Fig. 17.— Euzrixopsis javana, female 
found containing mature larvae. Breeding experiments were started 
immediately with adult flies from the field, presumed to be the same 
species, and the emergence of the adults from the larvae previously 
collected later confirmed this conclusion (fig. 18). 
Extended investigations on this parasite in Hokkaido revealed it 
in considerable abundance in several localities, and at Kotoni, a 
short distance from Sapporo, the field parasitism in 1922 and 1923 
was approximately 10 per cent. Prosena siberita is found abund- 
antly throughout northern Japan and, according to literature, occurs 
also in Europe, continental Asia, and the Oriental region, where it 
has been recorded from Java. 
