84 R. W. Dawson 



Ataenius cognatus Lc Conte. 



1858. Euparia cognata Le Conte, Proc. Acad. Nat. Sci. Phila., p. 65. 



Specimens examined : 50 5 , 97 $ , from Fort Calhoun. 

 Omaha, Weeping Water, South Bend, Lincoln, Fairmont, West 

 Point, and Halsey, collected from March to September. This 

 is our most abundant species and is often seen flying in count- 

 less numbers on a warm evening in early spring. 



Psammobius Heer 



1841. Heer: Fauna Coleopterorum helvetica, Turici, p. 531. 



1871. Horn: "Synopsis of Aphodiini of the United States", Trans. 

 Amer. Ent. Soc, iii, 284-297. (Descriptive notes and table 

 for 5 species). 



1887. Horn: "A Monograph of the Aphodiini Inhabiting the 

 United States", Trans. Amer. Ent. Soc, xiv, pp. 1-110. 

 (Descriptive notes and table for 7 species). 



1910. Blatchley: Coleoptera of Indiana, p. 922. (Descriptive 

 notes for 2 species). 



Psammobius interruptus Say. 



1835. Psammodius intemiptus Say, Boston Journ. Nat. Hist., i, p. 

 178. Le Conte ed., ii, pp. 651-652. 



Specimens examined : 5, from West Point, collected in 

 May and June. This species is recorded by Dr. Horn as un- 

 common in the middle states. 



Rhyssemus Mulsant 



1842. Mulsant: Hist. nat. d. Col. de France, Lyon, ii, Lamelli- 

 cornes, p. 314. 



1871. Horn: "Synopsis of Aphodiini of the United States", Trans. 

 Amer. Ent. Soc, iii, pp. 284-297. (Descriptive notes on three 

 species). 



1887. Horn: "A Monograph of the Aphodiini Inhabiting the 

 United States", Trans. Amer. Ent. Soc, xiv, pp. 1-110. 

 (Descriptive notes and table for 4 species). 



190 



