24 



Counties in which Collections were made, and 

 Numbers of Collections from each 



(Total, 1959 collections) 



Northern Illinois 



Central Illinois 



Southern Ill\ 



Inois 



Carroll, 1 



Adams, 



2 



Alexander, 



8 



Cook, 194 



Champaign, 



274 



Clay, 



3 



DeKalb, 1 



Coles, 



2 



Gallatin, 



4 



JoDaviess, 1 



DeWitt, 



8 



Hamilton, 



4 



Kane, 426 



Hancock 



6 



Jackson, 



144 



Kankakee, 5 



Iroquois, 



8 



Marion, 



21 



McHenry, 23 



Knox, 



380 



Massac, 



3 



Whiteside, 5 



Logan, 



1 



Perry, 



32 



Winnebago, 5 



McDonough 



, 4 



Pulaski, 



10 







McLean, 



252 



Richland, 



13 



661 



Macon, 



1 



St. Clair, 



5 





Mason, 



2 



Union, 



24 





Morgan, 



3 



Washington 



, 29 





Piatt, 



1 



White, 



11 





Pike, 



5 



Williamson, 



2 





Sangamon, 



3 









Vermilion, 



29 





313 





Warren, 



4 







985 



The localities from which specimens were collected within these 

 counties were twenty in northern, forty in central, and tw T enty-four 

 in southern Illinois — a total of eighty-four separate points or stations. 

 By far the larger part of our material was obtained, however, from 

 Aurora and Chicago and its suburbs in northern Illinois, from Cham- 

 paign, McLean, and Knox counties in the central part of the state, and 

 from Jackson, Perry, Washington, Union, and Marion counties in 

 southern Illinois. In these ten counties, indeed, nearly 97 percent of 

 all our collections were made, only 142 of our 1959 lots of specimens 

 coming from the remaining thirty-two counties. 



Numbers of Species and of Specimens 



The total number of species recognized in the state was thirty- 

 four, not counting for the present nineteen specimens as yet undeter- 

 mined. The number of representatives of these species varied from 2 

 specimens of liirtiventris to 43,439 of liirticula. Our collections of 

 the sixteen most abundant species amounted, in fact, to 97.9 percent 

 of the total number of the thirty-four species, and those of the ten 

 most abundant species amounted to 91 percent. In the northern sec- 

 tion of the state we took 15,457 May-beetles, belonging to twenty-one 

 species. The five most numerous of these species were represented by 

 84.8 percent of the entire number, and the nine most numerous, by 

 98.2 percent. In the central part of the state we collected 78.91 ."> 



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