36 



remaining years are 90 percent for northern Illinois and o percent 

 for each of the other divisions of the state. The species was dominant 

 in northern Illinois in 1910, when it gave us 36.9 percent of all our 

 northern Illinois May-beetles, the one next in abundance (fusca) giv- 

 ing us 22.9 percent. Anxia was subdominant at the north in 1913, 

 when it was exceeded only by fusca and inversa. It is apparently a 

 three-year species. In the year of greatest abundance, 1910, it was 

 first collected by us in northern Illinois April 15 and last occurred 

 there June 30, its greatest numbers falling between May 16 and June 

 16. It was taken by us, however, in that part of the state as late as 

 July 8. 



In respect to its food, as shown by 1244 specimens obtained by us 

 from food-plants, it is peculiar in the combination of a preference for 

 elm and willow. It is, in fact, first on our list of species from the elm, 

 in respect of course to its proportionate numbers on that tree. It is 

 fourth on our willow series, and fourth also on our series from the 

 poplar. It is thus essentially a willow-poplar species, with a further 

 exceptional preference for the elm. It was sixth on our list from 

 the apple, third on the cherry, third on the box-elder also, first en 

 the hackberry, second on the linden and the mountain ash, and tenth 

 on the oak. Three fourths of our specimens came, however, from the 

 elm, willow, poplar, and apple. 



PJiyllopliaga bipartita Horn 



Bipartita is a southern Illinois species, only 6 of our 1725 speci- 

 mens coming from central Illinois and none at all from northern. 

 Urbana is at present our northernmost point for the species in this 

 state. In 1907 and 1908 its numbers were very small, only 2 speci- 

 mens in the former and 46 in the latter, but in 1909, 797 were taken 

 and in 1910, 850, all in both years from a number of stations in south- 

 ern Illinois, Olney and Odin the northernmost and Carbondale the 

 farthest south. Its seasonal range was best shown in 1910 when our 

 earliest specimens were taken April 15 and our latest June 30. This 

 is primarily a willow species, 86 percent of our 645 specimens from 

 food-plants coming from willows. It has also some tendency to hick- 

 ory and oak, these two together yielding 12.2 percent additional. The 

 small numbers remaining were found only on persimmon and apple. 



PJiyllopliaga fraterna Harris 



Fratema is another southern species with a very sparse distri- 

 bution north as far as Chicago. There were 1512 specimens in our 

 six years' product, all but 64 of them from southern Illinois. Fifty- 

 eight came from various points across the state between Danville and 

 Galesburg, and 6 from Aurora, Edgebrook, and Calvary, in Kane and 

 Cook counties. Our earliest date in any year was March 28 in 1908. 



