Scarabaeidae of Nebraska 127 



1871. Horn: "Descriptions of New Coleoptera of the United 

 States, with Notes on Known Species", Trans. Amer. Ent. 

 Soc, iii, pp. 325-344. (Table and descriptive notes for 9 

 species) . 



1915. Casey: Memoirs on the Coleoptera, vi, pp. 124-158. (De- 

 scriptive table for 33 forms). 



SYNOPSIS OF THE SPECIES 



1. Clypeal suture rather strongly arched medially; sides of clypeus 

 subparallel basally, and more abruptly convergent apically; 

 general color paler hirta 



Clypeal suture nearly straight; sides of clypeus almost evenly, 

 arcuately convergent apically; general color darker 2 



2. Claws of anterior tarsi equal in size and similar to those of the 

 middle and hind tarsi (females) 5 



Claws of anterior tarsi unequal in size; the front claw very 

 much broader and more strongly bent (males) 3 



3. Elytra with sparse, erect, yellow hairs, largely confined to the 

 nearly obsolete costae; pygidium and body beneath with some- 

 what denser and longer hairs villosa 



Elytra bare except for a few short hairs at the apex and the 

 usual short marginal hairs 4 



4. Club of antenna distinctly longer than the stalk; claspers of 

 genital armature emarginate at the middle of the outer side longula 



Club of antenna shorter than the stalk; claspers of genital 

 armature emarginate just beyond the middle of the outer side, 

 and with the emargination emphasized basally by a strong, 

 oblique lobe or tooth immacidata 



5. Side margin of the elytra slightly but distinctly widened or 

 explanate just above the outer end of the hind coxal plates 6 



Side margin of the elytra plain and unmodified longula 



6. Elytra much more strongly and coarsely sculptured, the large 

 punctures tending to coalesce; sides of elytra but little or not 



at all clouded; body relatively shorter and broader in form... ..villosa 



Elytra less strongly and coarsely sculptured, the punctures 

 smaller and more distinctly separated; sides of elytra immedi- 



233 



