-540- 
In 19^+0, outside the Gays Mills area and especially at Lamont and Linden 
where "Brood C" flight was heaviest, P. hirticula was the predominant species 
and comprised 50. 03 percent of the 4,007 beetles collected. P. fusca , which 
was also abundant, amounted to 31*97 percent, and P. implicita , which ranked 
third, 5 * 9 ^ percent. 
At Gays Mills Phyllophaga rugose, was the predominant species and com- 
prised 57*59 percent of the l,06l beetles collected. P. fusca and P. ilicis 
(Enoch.), which ranked second and third, comprised 26.20 and 12.25 percent, 
respectively, of the total number of beetles. 
Host Preferences of the Beetles 
Because of differences in the relative populations of the various speci- 
of beetles and in the host-plant complex, the Gays Mills locality was studiec 
separately from the other areas and is considered separately in this paper. 
Outside the Gays Mills Area 
In Table 1 is a list of all beetles collected from all areas other than 
Gays Mills and of the host plants from which they, were taken. Table 1 is 
identical in form with those used in the Insect Pest Survey Bulletin Supple- 
ments previously referred to. There are three entries in each space, two 
percentages and a number. The top percentage indicates the proportion of all 
beetles belonging to the species named at the head of the column, which was 
taken from the food plant named at the left. The lower percentage gives the 
proportion of the total number of beetles taken from tho,t host plant made up 
of the species at the top of the column. The number located between the 
percentages in er,ch spr„ce represents the number of beetles of the species nam- 
ed at the head of the column which were taken from the plant mentioned at the 
left. Host plants are listed according to the total numbers of beetles of 
a.ll species collected from them, in descending order, a,s indicated in the 
vertical "Total" column. In addition to the plants shown in the tables, 
grape, sumac, boxelder, and other undetermined plants were examined, but no 
beetles were found on them. 
In these areas Phyllophaga hirticula was taken from 18 kinds o-f plants. 
Hazel, bur oak, cultivated plum, and oaks of the red oak group suppled 66.91. 
20.82, 2 . 88 , and 2.49 percent, respectively, of the total number of P. hirti- 
cula beetles, or 93*H percent. These hosts have been preferred by P. hirti- 
cula during previous years, but in some y ears shagbark hickory was also fed 
upon heavily. From observations and from the number of beetles taken by 
'shaking, black walnut is known to bo a favored host of P. hirticula but, as 
walnut we s scarce in the areas in which the beetles were hand-picked from 
hosts, this preference was not shown and consequently is not indicated in 
the table. 
Phyllophaga fusca was tfeken from 18 food plants also, but there was less 
concentration of this species on any single host than in the ca.se of P. hirti- 
cula . Aspen, bur oak, oaks of the red oak group, and dogwood supplied 34* 5^, 
25,84, IO. 38 , and 9*68 percent of the collected beetles, respectively, and 
together 80.48 percent. 
