eg = 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
M. H. Brunsen, of the domestic parasite project, Moorestown, N.J., 
sums up the season's observations on Centeter cinerea Ald. as follows: 
"Peetles parasitized by Centeter cinerea were collected from33 square 
miles of new territory, extending the area known to be occupied by the 
parasite to 179 square miles. Three thousand, one hundred and fifty— 
five parasitized beetles were collected in the field. Of this number 
56.01 per cent were males, 62.99 per cent were females, 67.36 per cent 
of the parasites formed puparia, and 91.80 per cent. of the eggs on the 
beetles hatched. About 13 per cent of the beetles were parasitized in 
locations where collections were attempted. Puparia were found in the 
greater part on top of the soil and in the first 2 inches. In propaga— 
tion work, 10,858 parasitized beetles were obtained from 756 females. 
From this number of beetles 5,264 puparia were recovered, 50.15 per cent 
of the beetles formed puparia, and 63.68 per cent of the eggs on the beet— 
les hatched. From 1,597 puparia propagated in 19350, 1,084 flies emerged 
and 67.87 per cent of the puparia formed flies." 
A comparison of the quantitative data obtained by Henry Fox, 
Moorestown, in the seasonal surveys of the soil population of the larvae 
of the Japanese beetle as regards the larval movements in the soil, 
indicates three periods during which larvae ascend or descend: (1) An 
upward movement in the spring, (2) a slight downward movement in late 
spring or early summer preceding pupation, and (3) a more marked down— 
ward movement in the fall. Seasonal variations in these movements are 
indicated as conditioned by temperature. The depth to which the larvae 
descend for winter dormancy rarely exceeds 8 inches * * * Most of the 
larvae do not burrow deeper than from 3 to 6 inches, though very few 
remain above 2 inches. They evidently cease burrowing whenever the soil 
temperature at the level which they happen to have reached falls to 50° 
F. This latter fact, it may be added, has some bearing upon the possible 
future establishment of the Japanese beetle in the more northern sections 
of this country. If the larvae in these sections do not burrow deeper in 
the soil than do those in the latitude of central New Jersey, there is 
considerable probability that they will perish, as in severe winters 
soil temperatures, as far down as the larvae normally penetrate, fall 
at times below those which the available data indicate as 100 per cent 
fatal to Japanese beetle larvae. 
I. M. Hawley has been making a study of the lateral migration of 
larvae of Popillia japonica Newm. in soil under greenhouse conditions. He 
describes the experiment as follows: "Four bins, each 4 feet square, 
were set up and filled with 12 to 15 inches of Soil. In.a trench acroge 
the middle of each bin, 100 grubs were placed at depths of 3 to 5 inches 
cn October 27. The soil in the bins was kept moist and the soil tempera— 
ture was normally between 65° and 75° F. The soil in the 4 bins was 
removed at intervals after 7 to 37 days had elapsed, at which time the 
lateral and vertical position of each grub was recorded. In general it 
may be said that some grub have shown a decided tendency to move from 
