35 



1909 and 1 percent or less in 1910, 1911, and 1913. That this decline 

 was not local merely, is shown by the fact that it affected our numbers 

 for central Illinois also, which fell from 341 specimens in 1908 to 15 

 in 1909, to 5 in 1910, to 3 in 1911, and to none at all in 1913. 



Rugosa is very scarce in Davis 's northern Illinois collections made 

 in 1914, and it evidently had no share in the extensive injury done 

 to crops thruout northern Illinois by white- grubs in 1912. 



It is a late species in its seasonal appearance, our earliest col- 

 lections in northern Illinois coming from May 25 to June 14, and those 

 in central Illinois from May 15 to June 12. 



It stands first on our list of poplar species, and second among 

 those from willow, where it is surpassed only by bipartita. Seventy- 

 one percent of our specimens of rugosa collected from food-plants 

 came, in fact, from these two trees. It is eighth on our list from the 

 oak and fourth on that from the blackberry. Of 200 specimens ob- 

 tained in systematic work on oaks, elms, poplars, and willows, in 1906, 

 169 were taken on poplars and the remainder on elms. This is ap- 

 parently a species of minor economic importance. 



PTiyllopliaga micans Knoch 



Micans is a persimmon-oak May-beetle with distinctly southern 

 distribution, 2671 of our 2700 specimens having come from that part 

 of the state, with 10 from central and 19 from northern Illinois, the 

 last from Aurora and stations about Chicago. In southern Illinois it 

 is a common species, third in order of abundance there, and making 

 13.3 percent of all our collections from that section. It was, indeed, 

 our dominant species there in 1907 and 1908, fourth in abundance in 

 1909, and second in 1910. Our earliest southern Illinois dates for its 

 occurrence are April 4 and 18, and our latest are June 30 and July 12. 



Eighty-five percent of the 1431 specimens collected from food- 

 plants came from persimmon- and oak-trees — 50.7 percent from the 

 former and 34.2 from the latter. Indeed if we take account of the 

 larger number of collections made from oaks than from persimmons 

 in southern Illinois, and adjust our ratios accordingly, we find that 

 about four times as many of these beetles would have been obtained 

 from persimmons as from oaks if equal numbers of these kinds of 

 trees had been taken. Micans thus seems to be essentially a persimmon 

 species. 



PhyllopJiaga anxia Leconte 



Anxia (formerly known as dubia) is almost as distinctly a north- 

 ern species as micans is a southern one, 1959 of our 2116 specimens 

 coming from the northern part of the state, 82 from central Illinois, 

 and 75 from southern. Five hundred and ninety-three of these beetles 

 were obtained, however, in 1911 and 1913, when we made no southern 

 Illinois collections; and after subtracting these, the ratios for the 



