40 



showed, during the years covered by our southern Illinois collections, 

 no conspicuous fluctuations in abundance. So far as we may judge 

 from the 255 specimens collected from plants, crenulata seems to be 

 a persimmon species, with willow and hickory as second choices. One 

 hundred and five of our specimens (41 percent) were taken from per- 

 simmon trees, 41 (16 percent) from willows, and 25 (10 percent) from 

 hickory — two thirds of our little collection from these three trees. A 

 unique additional feature is the occurrence of 22 specimens in four 

 collections from poison ivy. Elm, grape, and hackberry are repre- 

 sented by small numbers, and oak by still smaller. 



PJiyllopliaga corrosa Leconte 



Corrosa is represented by 476 specimens, only 1 of which was 

 from northern Illinois, all the rest coming from the southern part of 

 the state. The earliest date of capture was April 9 in 1910, and the 

 latest, July 2, in 1907. Ninety-five specimens taken from food-plants 

 show that corrosa is clearly an oak-hickory-persimmon species, with 

 persimmon apparently preponderating as food. All the specimens 

 were taken from these plants except 2 from blackberry. 



PJiyllopliaga drakii Kirby 



Drakii, commonly labeled grandis in collections, is northern in its 

 Illinois distribution, only 8 of our 429 specimens having come from 

 the southern part of the state. Its increasing abundance northward 

 is shown by the fact that our central Illinois collections amount to 

 less than 2 percent of our total for that part of the state, while those 

 for northern Illinois were nearly 18 percent of the northern Illinois 

 total. 



This species is evidently late in appearance, our earliest dates 

 generally coming from the middle to the end of May. We have, how- 

 ever, one capture made April 21 in central Illinois, and another May 

 2 in the southern part of the state. Our latest specimens were ob- 

 tained from the middle to the end of June, with the exception of one 

 on July 7. 



The food of drakii seems to be highly composite, if we may judge 

 from our 378 specimens collected from trees and shrubs. The species 

 was taken most frequently on willow, poplar, oak, elm, hazel, and 

 blackberry, in ratios diminishing from 20 percent on willow to 13.5 

 percent on elm and 9.8 percent on blackberry, the total for these seven 

 plants being 86.4 percent. Other plants resorted to, by small num- 

 bers of the beetles, were rose, ash, gooseberry, mountain ash, birch, 

 honey-locust, raspberry, apple, hawthorn, plum, box-elder, and Vi- 

 burnum. 



