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Flight .—.Obs ervat ions on emergence and flight of the "beetles agreed 
essentially with those made in 1535 and 1936. Phyllopha^a tristis emerged from 
10 to 15 minutes earlier in the evening than did the other species and "began 
flight and mating earlier in the season. P. fusca also "began emergence earlier 
in the season hut mated later. P. ilicis appeared late; was found mating hut 
rarely until late in the season; and, as indicated in rearing cages, began 
oviposition later than other species. Small flights occurred at temperatures 
in the low 50 's hut major flights occurred in the 6o's and 70*s. 
There was considerable variation in the duration of the flight period. 
On some nights the main emergence and flight to host plants was completed within 
about 5 minutes and on other nights emergence .and flight continued slowly but 
more or loss evenly for almost an hour. Soil and air temperatures and wind 
conditions, as recorded by us, do not explain this behavior. 
Species .~ ~Phvllophaga , hirt icula , the predominating species, was abundant 
in the Hollandale and Lamont districts but rare at Gays Mills. P. ilicis and 
P. rugos a were abundant at Gays Mills but less numerous elsewhere. As shown in 
table 6, the five most common species, P. hirt icula . P. fusca . P. rugos a . P. 
ilicis . and P. implicita . comprised 39»31f 23. Us, 18.59* 7*21, and 3,6% percent, 
respectively, and together made up 92.27 percent of the total. The solitary 
specimen of P. spreta was taken from butternut at Gays Mills. Of the 7,280 
beetles, 106 were taken at Gays Mills and 82 at Blue Mounds between the 1st and 
18th of July, inclusive, and all the others before July 1. Because of their 
scarcity, the beetles taken after July 1 were not classified in a separate table 
as was the case with those taken in 1935. 
Knst preferences ,~~Table 7, which is similar to tables 2, 3, and 5, 
showing the number of each species of beetles taken from each kind of host plant 
(or related group of host plants) and the percentage of the total each species 
comprised, is a consolidation of collections made during 52 flights in 10 
districts in southwestern Wisconsin. Thirty-two flights were observed on 30 
nights at Gays Mills and 21 flights on 19 nights in the remaining 9 areas. The 
groves, where observations were made, were near the following towns: Gays Mills, 
Crawford County; Waunakee, Madison, Blue Mounds ,-£/ Dane County; Edgerton.i/ Rock 
County; Hollandale, Iowa County; Lodi, Poynette, and Leeds, Columbia County. 
8/ The grove was south of Blue Mounds, near the border of Iowa County. 
2/ The grove was north of Edgerton, in Dane County. 
