040 



FAMT LY L. S C A B A B M I DiE . 



Tribe V. ACANTHOCERINI. 



To this tribe belong three small, oval, convex, smooth, shining 

 beetles, living under bark and in rotten wood. They have the man- 

 dibles and labrum of horn-like texture and prominent ; the antennae 

 10-jointed, club 3- jointed ; front coxaj conical, prominent; middle 

 coxae transverse, contiguous ; ventral segments five, loosely united ; 

 pygidhun entirely covered by the elytra; tarsi with slender claws 

 without a process between them. One of the two genera compris- 

 ing the tribe is represented in Indiana. No papers treating of the 

 tribe as such have been published, the descriptions of the species 

 being isolated. 



XVI. Clceotus Germ. 1843. (Gr., "girdled.") 



This genus contains two small species having the middle and 

 hind tibiaa thick ; body partially contractile, so that it may be rolled 

 up into a somewhat hemispherical mass, much in the same manner 

 as in the members of the genus Agathiclium of the Silphidae. The 

 scutellum is large, triangular and attenuate behind and the elytra 

 are not striate. 



1775 (5608). Clceotus aphodioides 111., Germ. Zeitsch., IV, 1805, 137. 

 Short, oval or subglobose. Blackish or purplish-bronzed, polished. Cly- 



peus rounded in front, finely and sparsely punctate. Thorax about twice 

 as broad as long, sides nearly straight ; hind angles rectangular, disk finely 

 and sparsely punctured and with two impressions each side near the mar- 

 gins. Elytra with the side margins entire, surface with rows of long, 

 deeply impressed, rather close punctures, and with three or four elevated 

 lines on apical third, the outer one longer. Length 4^1.5 mm. 



Southern half of State ; frequent. April 9-November 22. Oc- 

 curs beneath bark, especially that of oak and hickory. Easily dis- 

 tinguished from the next species by its smaller size and the more 

 closely placed punctures and entire side margins of elytra. 



1776 (5609). Clceotus globosus Say, Bost. Journ. Nat. Hist., I, 1835, 179; 



ibid. II, 653. 



Form and color of the preceding but slightly larger. Clypeus finely 

 rugose. Thorax much more densely punctate. Elytra with the side mar- 

 gins finely denticulate ; the punctures oblong, separated from each other by 

 a distance about equal to their length ; apical half with four or five slightly 

 elevated lines, the two outer ones extending toward the humerus. Length 

 5-5.5 mm. 



Throughout the State ; scarce. March 20-November 30. Prob- 

 ably hibernates as imago. The specimens taken on November 30 



