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Host preferences ..~In the lU districts in which host preferences of 
the "beetles were studied, a great variety of host plants occurred, hut the 
numher of species of hosts varied considerahly in the different districts. 
For example, only "bur oak, aspen, hickory, elm, and sumac occurred in the 
grove at Madison, whereas at Waunakee these and l6 other species of hosts 
were present*. The districts were as follows: Dane, Waunakee, Madison, 
Blue Mounds, 3-' and Verona, in Dane County; Edgerton^ in Rock County;-/ 
Blanchardville, in Lafayette County; Sturgeon Bay, in Door County; Ripon, 
in Fond du Lac County; Merrimack in Sauk County; Mineral Point, Linden, ard 
Hollandale, in Iowa County; and Gays Mills, in Crawford County. 
Tahles have "been made classifying each species according to the host 
from which it was taken in each collection, hut these are too voluminous to 
he included here. A total of U9 collections from the lU districts have "been 
consolidated and shown in tahles 2 and 3» Tahle 2 gives all the "beetles 
collected "before July 1 and their hosts, and tahle 3 gives the sane for 
"beetles taken after July 1. 
It will he noted that there are three entries in most of the spaces 
in these tahles, consisting (reading from the top) of a percentage, a nunher, 
and a percentage. The top percentage represents the proportion of the species 
given at the top of the column which was taken from the host at the left; the 
numher represents the individuals of that species taken from that host; and 
the lower percentage, the proportion of all individuals of all species found 
on that host represented hy the species at the head of the column. For example, 
we find in tahle 2 that 6U6 individuals of Phvllp-phaga rugosa were taken from 
hickory, and that this represented lU.7 percent of the total numher of P. rugosa 
taken and 63.5 percent of the total individuals of all species taken from 
hickory. Percentages are not shown in cases where they are very low. 
Phyllophaga rugosa was taken in all the districts where flight studies 
were made and, as shown in tahle. 1, it was the most numerous of all species 
and comprised U2.3U percent of the total heetles taken. It was also the most 
general feeder and was taken from 35 hosts. It fed heavily on hickory, hur 
oak, willow, poplar, elm, basswood, and, in the Cays Mills area, on cultivated 
cherry and hoxelder. The first six of the hosts furnished 57.8 percent of the 
total taken before July 1 and 80. 2 percent of the total taken after July 1. 
flone were taken from basswood after July 1. 
T^e grove studied was south of Blue Mounds, near the "boundary "between Dane 
and Iowa Counties. 
y 
The grove was north of Edgerton, in Dane County. 
