THE PARASITES OF POPILLIA JAPONICA 
17 
that number of eggs, whereas one with 22 follicles yields a corre- 
spondingly greater number This conjecture is borne out by the 
subsequent examination by dissection of the ovaries of the particular 
females under observation. 
CHARACTERS FOR DETERMINING THE IMMATURE STAGES OF CENTETER CINEREA 
First-stage larva (fig. 11, A). — Length approximately 0.7 mm.; color white. 
Mouth parts modified for rasping, as shown in D. Visible tracheal system con- 
sisting of two longitudinal trunks; caudal spiracles small and inconspicuous. 
Second-stage larva (fig. 11, B). — Posterior ^ spiracles fairly prominent, with a 
hooklike projection, as shown in E. The main tracheal trunks fairly heavy, with 
two main transverse commissures connecting them at the fourth and eleventh 
segments. Posterior half of last segment and hind margin of the eleventh segment 
bearing numerous short but stout spines. There are two prominent lobes at the 
anal opening. 
Third-stage larva (fig. 11, C). — Length 8 to 10 mm.; color white. Mouth parts 
as shown in H and I. Anterior spiracles with five openings, as in G. Posterior 
spiracles as in F. Posterior area of the caudal segment bearing numerous stout 
spines. 
Puparia (fig. 14, D). — Length 5 to 7 mm.; color brown, surface striate, reflec- 
tions dull. Shape elongate-oval. Thoracic spiracle present, in the form of an 
elevated tube; posterior spiracle as in D. 
OCHROMEIGENIA ORMIOIDES Townsend 
GENERAL OBSERVATIONS 
Adults of Ochromeigenia ormioides were first obtained from Popillia 
japonica collected at Yokohama 
in June, 1921 (fig. 15). It was 
later found as far north as 
Koiwai, Japan, and at Suigen, 
Chosen. The species was first 
described by Townsend from 
collections made in Java, and 
it has also been recorded from 
western China. As far as known 
it is a parasite of adult Scara- 
baeidae only. 
Apparently this species is 
more or less periodic in its oc- 
currence on Popillia. In the 
summer of 1920 empty puparia 
were found in the breeding 
cages, which later proved to 
belong to this species. The 
number obtained at this time 
was small, indicating an ex- 
ceedingly low percentage of 
parasitism. In 1921 collections 
yielded less than 1 per cent of 
parasitized beetles. However, 
collections in 1922 in the vicinity 
of Tokyo and Yokohama ran as 
high as 35 per cent, and this 
was followed in 1923 with a 6 per cent parasitism. 
Ochromeigenia ormioides has three broods of adults per season, the 
first two of which parasitize Popillia and the third develops in^other 
Scarabaeidae. 
98689—27 3 
Fig. 15. — Ochromeigenia ormioides, female 
