Scarabaeidae of Nebraska 59 



vinced that the only major differences are truly specific after 

 all. Then he can turn to Serica only to discover, through the 

 phenomenal characters in the male genitalia, that the species 

 may be legion, and differ from each other only by minor, or 

 almost wholly negligible, external characters. At this junc- 

 ture he may well take up Polyphylla, Cyclocephala and Ligy- 

 rus, where both external and genital characters seem in- 

 adequate, and ponder the advisability of the monographer 

 making life-history studies and chromosome counts before 

 finally deciding the limits and nature of the species. 



In concluding these remarks thanks are due to many 

 persons for aid in accumulating the collection and kindly 

 loaning much of the material that has been at the writers 

 disposal. Especially are acknowledgements due to Professors 

 Lawrence Bruner and Myron H. Swenk for encouragement 

 and direction in the work. 



SYSTEMATIC SYNOPSIS OF NEBRASKA 

 SCARABAEIDAE 



Family SCARABAEIDAE: 



Subfamily Laparosticti : 

 Tribe Coprini : 



165 



