Scarabaeidae of Nebraska 93 



1775. Fabricius: Systema Entomologiae, p. 31. 



1854. Le Conte: "Descriptions of the Species of Ti'ox and Omorgus 

 Inhabiting the United States", Proc. Acad. Nat. Sci. Phila., 

 vii, pp. 211-216. 



1874. Horn: "Revision of the Species of Trox of the United 

 States", Trans. Amer. Ent. Soc.,v, pp. 1-12. Descriptive notes 

 and table for 21 species). 



1910. Blatchley: Coleoptera of Indiana, pp. 941-947. (Descrip- 

 tive notes and table for 15 species). 



1922. Loomis: "New Species of the Coleopterous Genus Trox", 

 Journ. Wash. Acad. Sci., xii, pp. 132-136. (Characterizes 3 

 forms from the southwest in the scutellaris section of the 

 genus, and points out the specific value of the characters in 

 the male genitalia). 



SYNOPSIS OF THE SPECIES 



1. Scutellum strongly narrowed near the base, with the sides angu- 

 late at the middle; sides of pronotum never margined with 

 scales or stiff hairs 2 



Scutellum not narrowed at the base, the sides not angulate, 

 but curved; sides of pronotum often margined with scales or 

 hairs 6 



2. Base of elytra distinctly narrowed, with the humeral angles 

 very broadly and strongly rounded [scutellaris] 



Base of elytra not more strongly narrowed and rounded than 

 usual 3 



3. Elytra with rows of very distinct tubercles 4 



Elytra with rows of feebly elevated, bare tubercles connected 



by elongate, tomentose spots suberosus 



4. Tubercles prominent, bare and shining, with tomentose spots 

 behind them ptinctatus 



Tubercles at least on the posterior side tomentose 5 



5. Tubercles large and coarse, bare and shining anteriorly, and 

 tomentose behind; first joint of antennae with dark brown hairs; 

 antennal club dark scabrosus 



199 



