THE LAMETjT jcorn beetles. 



935 



sparsely punctate with finer punctures intermingled. Elytra as wide at 

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

 crenately punctate ; intervals nearly fiat, sparsely and finely punctate. Length 

 7-9 mm. 



Orange County ; scarce. September 9. 



A. humeralis Lee, black, shining-, elytra! stria^ .fine with large 

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

 Maryland. 



Tribe TIL ORPHNINL 



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 labrum of horn-like texture, 

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

 preceding tribes; antenna 10-jomted, club three-jointed; eyes not 

 emarginate; front coxae prominent; middle coxae oblique, 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.— 'Oehod&ns— Synoptical Table of," in Trans. Amer. 



Ent. Soc, II, 186.8, 50-52. 

 Horn. — "Revision of the U. S. Species of Ochodams and other 



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



177-197. 



XI. OciiODiEUS Serv. 1827. (Gr., "to carry + tooth. ") 



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

 one of which occurs east of the Mississippi. 



1767 (5578). Ochod^eus musculus Say, Bost. Journ. Nat. Hist.. I, 1835, 

 178 ; ibid. II, 652. 



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

 • with short erect hairs. Head coarsely punctured ; ciypeus 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 in female ; a rounded impression on the middle of each 

 side. Elytral striae 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. 



