52 
BULLETIN 1429, U. S. DEPARTMENT OF AGRICULTURE 
section of the United States. The forest areas here are entirely 
artificial, consisting for the most part of regular plantings of chestnut, 
larch, and pine. 
" These agricultural conditions may be a factor influencing the 
relative abundance of Popillia japonica within certain regions. 
From Sendai southward is the region of intense cultivation, as 
Fig. 35.— A, terraced hillside planted with orange trees, showing intensive agricultural conditions 
in southern half of Japan; B, rice paddy lands in a valley, illustrating intensive agricultural con- 
ditions in central Japan 
described in the preceding paragraphs, and within this region Popillia 
is much less abundant than northward. This lack of abundance 
may be the result of the intense cropping of the soil and the flooding 
of the paddy fields, practices which are most unfavorable for soil- 
inhabiting insects. Further, within this region there are very few 
grasslands other than dense growths of low bamboo grass, these 
latter being rarely inhabited by Popillia. On the other hand, north 
of Sendai, including Koiwai and the island of Hokkaido, Popillia is 
