- 23U .. 
During the season 3^ flights were observed in 10 areas as follows: 
G a ys Mills, Crawford County, l6 flights; Black Earth, Dane County, 2 flights; 
Dane, Dane County, 2 flights; Waunakee fe Dane County, 2 flights; Lamont, - . 
Lafayette County, U flights; Edgerton,-*/ Rock County, 3 flights; Blue Mounds,-' 
D a ne County. 2 flights; Madison (Lake Forest), Dane County, 1 flight; Madison 
(Gregg Farm), 1 flight; Hancock, Waushara County, 1 flight. 
Phyllophaga rugosa was, relatively speaking, common except at Lamont, 
According to the classification of the table, it was taken from 21 kinds of host 
plants. It fed predominantly on cultivated cherry, dogwood, aspen, basswood 
(linden), white oak, oaks of tho red oak group, bur oak, and ironwood, these 
host plants furnishing 26. 91, 9. 38, 8,*+0, 8.15, 7.90, 7.l6, 5.93, and 5.68 per- 
cent, respectively,, and together 79*51 percent of the total. The cultivated 
cherries, upon which many beetles were found, are at Gays Mills in a commercial 
planting* Leaving out of consideration for tho moment this host, the diversified 
feeding habits of P. rugosa become apparent, for the maximum percentage from any 
other host plant was 9*33 percent, from dogwood* 
Phyllophaga implicita occurred in all the areas studied and was taken 
from eight different host plants, willow, aspen, and other species of poplar 
furnishing 9^.32 percent of the total, 
Phyl lophaga fusca was taken from 15 kinds of plants, butternut,, aspen, 
dogwood, and oaks of the red oak group supplying 26.53. 23.^7, 17«35» <"^cL 10,20 
percent, respectively, and together 77*55 percent of the total, 
Phyllophaga futilis was taken from 12 species of host plants, mostly 
at Lamont. Prickly as hi/ supplied 35.63 percent of the total. This host, to- 
gether with plum, locust, elm, aspen, and hazel, yielded 83.9 percent of the 
total. Only 6,9 percent of the total was taken from oaks, although these were 
common in the areas where P. futilis occurred. 
The number of Phyllophaga tristi3 beetles collected from hosts other 
than oak was very small in comparison with the number observed on the oaks, but 
19 species of host plants other than oaks were recorded. Some preference 
appeared to be. shown for birch, dogwood, and aspen. 
Studies in 1937 
Methods of study in 1937 were essentially the same as those used in 
1935 ^nd 1936; however, some of the groves previously used were not suitable 
for collection in 1937. These were abandoned and others were selected. In 
the emergence of "brood C" of beetles in 1937, all species, as compared with 
1935, were scarce, with the exception of Phyllophaga hirticul a. which is 
normally abundant in this brood in Lafayette and Iowa Counties, On the other 
handball species, with the exception of P. tristis . were more abundant in 1937 
than in 1936, I n 1938 the flight will be a major one for all species, including 
P_. tristis . 
5/ — 
The grove studied was north of Edgerton, in Dane County. 
-/The grove studied was south of Blue Mounds,' near the border of Iowa County, 
^•' Xanthoxylum anericanun . 
