71 ~ 
The number given for Phyllophaga tristis in this list is too small, 
for the reason that this species feeds extensively on the high parts of 
large oak trees, largely to the exclusion of other plants, and in 1936, 
when there was a tremendous flight of this species and extremely small 
flights of the others, their relative abundance could not he ascertained. 
The number given was derived from collections from low shrubs and trees 
in groves where other species were present. The data should be fairly 
accurate, however, if the year 1936 is not considered. 
The other beetles collected, listed in a descending order of popu- 
lations, consisted of the following species: Phyllophaga prunina , P, drakei , 
P. bal ia , P. futilis , P. nitida, P. crenulata , P. anxia , P. marginal is , P. 
spreta (Horn), P. inversa , P. fosteri (Burm.y, P. vilifrons (Lee,),' and 
P. sp.?, making a total of 18 determined and 1 undetermined species. 
The chief host plants of June beetles in general are given in table 6, 
and the chief host plants of the principal species in table 7. An exam- 
ination of table 6 shows definitely the importance of hazel brush, bur oak, 
and hickory as food for the beetles and indicates that if destruction of 
any considerable portion of the principal species of June beetles is at- 
tempted by spraying, the low shrub, hazel, must be sprayed in addition to 
the trees. Where protection of valuable trees or shrubs is the objective, 
rather than materially reducing the numbers of adults and grubs in any 
considerable area, spraying is effective. 
Table 6, — Chief host plants of all species of June beetles collected, 
1935-41 
Beetles collected 
Host plant 
Humber 
Percentage of total 
Hazel 
12,173 
21.60 
Pur oak 
8,105 
14.38 
Hickory 
5,247 
9.31 
Cherry ( rul tiva.ted) 
4, 731 
8.40 
Popuius spp, , mostly aspen... 
4, 677 
8.30 
Ped oak group 
4,122 
7.32 
Butternut. . . . 
3 971 
7.05 
Dogwood T 
3, 252 
5.77 
Wallow 
2,186 
3.88 
White oak 
1,334 
2.37 
Total 
49,798 
88.38 
