r 



Scarabaeidae of Nebraska 85 



SYNOPSIS OF THE SPECIES 



1. Clypeus angulate or subangulate on each side; intervals of 

 elytra with a double row of nearly equal tubercles sonatus 



Clypeus obtuse or rounded on each side of the emargination ; in- 

 tervals of elytra with a row of small tubercles on the inner side, 

 a continuous, finely elevated line on the outer side iscaberl 



Rhyssemus sonatus Le Conte. 



1881. Rhyssemus sonatus Le Conte, Trans. Kansas Acad. Sci., x, 



p. 77. 



Specimens examined : 6, from Lincoln, collected in April, 

 June and July. Sonatus is also recorded from Iowa, Kansas, 

 Colorado and Montana. 



[Rhyssemus scaber Haldeman. 



1848. Rhyssemus scaber Haldeman, Journ. Acad. Nat. Sci. Phila., 

 p. 107. 



No specimens of this species are at hand from Nebraska, 

 but judging from Dr. Horn's statement, "occurs at the mar- 

 gins of streams from the Middle States to Texas," it is to be 

 expected in the state.] 



Orphnini 



Oval, convex species, brown or dull yellow in color 

 covered above with short, erect hair; elytra striate; clypeus 

 not expanded as in the two preceding tribes, and mandibles 

 and labrum visible; principally western in range. 



Ochodaeus Serville 



Little is known of the habits of the species in this genus, 

 and they are seldom seen except at lights in the evening. 



1825. Serville: Entomological part of Encyclopedie methodique, 

 X, p. 360. 



1868. Le Conte: "New Coleoptera Collected on the Survey for the 

 Extension of the Union Pacific Railway, E. D. from Kansas 



191 



