130 R. W. Dawson 



Specimens examined : 43 <5 , 45 $ , from South Sioux 

 City, Omaha, South Bend, Lincoln, Neligh, Halsey and Mc- 

 Cook, collected from April 22 to October 7, mostly at lights. 



Ligyrodes n. sp. in Ms. by Casey. 



Specimens examined : 2^,1$, from South Sioux City, 

 collected from June 10 to July 8, 1912 by L. T. Williams. 



Ligyrus Burmeister 

 1847. Burmeister: Handbuch der Entomologie, v, p. 542. 



1875. Horn: "Synonymical Notes and Descriptions of New Species 

 of North American Coleoptera", Trans. Amer. Ent. Soc, v, 

 pp. 126-156. (Table to 4 species). 



1915. Casey: Memoirs on the Coleoptera, vi, pp. 186-209. (De- 

 scriptive table to 33 forms). 



SYNOPSIS OF THE SPECIES 



1. Pronotum with an anterior, median impression and a blunt 

 tubercle at the front margin of the impression; color brown, 

 moderately shining- gibbosus 



Pronotum without the anterior impression and blunt tubercle; 

 color black and not very shining rugiceps 



Ligyrus rugiceps Le Conte. 



1856. Ligyrus rugiceps Le Conte, Proc. Acad. Nat. Sci. Phila., viii, 

 p. 21. 



Specimens examined : 1 s , 1 9 , from Lincoln, the fe- 

 male without further data, and the male labeled "July 7, 

 1914, E. M. Partridge". Rugiceps is an abundant and de- 

 structive species in the southern states, Georgia to Texas, 

 where it is called the Sugar-cane Beetle because of its in- 

 jury to that plant. Corn is frequntly killed by the burrow- 

 ing of this insect into the base of the stalk below the sur- 

 face of the soil. 



Ligyrus gibbosus De Geer. 



1768. Scarabaeus gibbosus De Geer, Memoires pour servir a 1' 

 histoire des Insectes, iv, p. 322. 



236 



