THE LAMELTJCOUX BEETLES. 



935 



sparsely punctate witli flnei- punctures intermingled. Elytra as wide at 

 base as thorax, with a distinct tooth on each humerus ; strl;e deep and sub- 

 crenately riunctate ; intervals nearly flat, sparsely and finely punctate. Length 

 7-9 mm. 



Orange Coitnty ; scarce. September 9. 



A. humcraJis Lee., black, shining, elytral strife fine ■\\-ith large 

 round distant pnnctnres, is known from Detroit, Michigan, and 

 ilaryland. 



Tribe III. ORPHNINI. 



This tribe is represented in the United States by a single genus 

 comprising oval, convex species, covered above with short, erect 

 hairs. They have the mandibles and labrtuit of horn-like texture, 

 not covered by the elypeus, which is not expanded as in the two 

 preceding tribes; antennse lO-.jointed, club three-jointed; eyes not 

 emarginate; front coxa^ prominent; middle coxfe obliciue, contigu- 

 ous; elytra striate, covering the abdomen; ventral segments six, 

 not firmly united ; tarsi with a small seta^-bearing process between 

 the claws. The principal papers treating of the North American 

 species are as follows : 



Horn. — "Ocliod;eus — Synoptical Table of," in Trans. Amer. 



Ent. Soc, II, 1868, 50-52. 

 Hopii. — "Revision of the U. S. Species of Ochod^eus and other 



Genera of ScarabajidiB," in Trans. Amer. Ent. Soc, V, 1876, 



177-197. 



XI. OcnOD.ET'R Serv. 1827. (Gr., "to carry + tooth.") 



To this genus, as characterized above, belong eight species, only 

 one of which occurs east of the Mississippi. 



1707 (5.'^i7S). OCHOD.EUS musculus Say. Bost. Jouru. Xat. Hist, I, 1835, 

 178 ; ibid. II, 652. 



Oval, convex. Uniform reddish- or chestnut-brown, sparsely clothed 

 with short erect hairs. Head coarsely punctured; elypeus with a double 

 margin, the upper one forming a curved carina ; vertex with a feeble trans- 

 verse carina. Thorax three times as wide as long, sparsely punctured In 

 male, more densely m female; a rounded impression on the' middle of each 

 side. Elytral stride rather closely punctured; intervals subconvex, each 

 with two or three irregular rows of small punctures. Length 5-6 mm. 



Two specimens from near Hessville, Lake County. June 13- 

 June 17. Say described the species from a single female taken near 

 New Harmony, Posey County. Horn records it from Michigan, 

 Dakota and Nebraska. 



