THE LAMELLi CORN BEETLES. 



015 



curs beneath flat stones on hillsides near Wyandotte Cave. This 

 and the next are the smallest species of the genus. 



1727 (5439). Canthon perplexus Lee. Journ. Phil. Acad. Nat. Sci., Ser. 2, 

 I, 1847, 85. 



Broadly oval or subrotund. Brown bronzed, shining. Thorax rather 

 coarsely punctured. Elytra more finely punctured, each puncture bearing 

 a very small, recumbent, scale-like hair. Hind tibiae slightly curved. Length 

 4.5-5.5 mm. 



Knox County; rare. July 8. A single specimen from border 

 of cypress swamp. Known from Illinois and westward. 



II. Chceridium Lep. 1825. (Gr., "a young pig.") 

 This genus contains tw T o small, rounded species resembling 

 Hister in general appearance. They have the under side of thorax 

 transversely carinate and, as in the next three genera, the middle 

 and hind tibiae much expanded at apex. By this character they 

 may be readily separated from the small species of Canthon. One 

 of the two has been taken in Indiana. 



*1728 (5441). Chceeidium histeeoides Web., Obs. Ent, 1801, 37. 



Rounded, convex. Bronzed above ; dark chestnut 

 brown beneath, strongly shining. Clypeus emarginate 

 or two-toothed. Thorax with a feeble median im- 

 pressed line on basal half and a small, deep rounded 

 impression on each side ; surface sparsely and shal- 

 lowly punctured. Elytra finely striate, the striae in- 

 distinctly punctured. Male with spur of front tibiae 

 dilated in the form of a small, circular sessile disk. 

 Length 6-7 mm. (Fig. 361.) 



Throughout the State ; common in the south- 

 ern, scarce in the northern counties. Occurs Fig36i. u 



(Original.) 



most abundantly in half-dried cow dung, and 



hibernates sparingly beneath this and logs. February 23-Novem- 



ber 17. 



III. Coprjs Geoff. 1762. (Gr., "dung.") 

 Medium or large-sized species having the labial palpi broad, 

 compressed and 3-jointed : the front coxa? conical, large and prom- 

 inent; all tarsal claws distinct but without a bristle-tipped process 

 (onychium) between them. The males have the head or thorax or 

 both either tuber culate or horned. The species of Copris do not 

 transport excrement in balls any great distance, but bury it in bur- 

 rows on or near the spot. 



KEY TO INDIANA SPECIES OF COPRIS. 



a. Elytra each with eight striae; front of head semicircular; thorax with a 

 transverse carina on sides beneath. 



