THE CARRION BEETLES. 



289 



tate. Elytra broadly oval, continuing the curve of the thorax ; surface 

 irregularly punctate, sometimes with larger punctures forming sinuous rows 

 near the sides and suture. Hind femora of male with a broad, acute tooth 

 at apex. Length 1.6-2 mm. 



Starke County; rare. June 17. Larger and darker than egena, 

 with the legs less thickened and the tarsi more slender. 

 562 (1792). Cyrtusa egena Lee, Proc. Phil. Acad. Nat. ScL, 1853, 284. 



Oval or subglobose, very convex. Pale brownish-yellow, shining. Thorax 

 more than twice as wide as long, narrowed in front; surface sparsely and 

 very finely punctate. Elytra each* with eight somewhat irregular rows of 

 very fine punctures ; intervals flat, smooth, or rarely with a few fine punc- 

 tures. Tarsi very short and much compressed. Length 1-1.5 mm. (Fig. 

 143, e.) 



Marshall, Monroe and Perry counties ; scarce. May 16-June 10. 



Isoplastus fossor Horn, hemispherical or broadly oval, very con- 

 vex, reddish-yellow in hue, length 1.5-2 mm., was described from 

 Detroit, Michigan, and the District of Columbia. 



XIII. Agathiditjm Illig. 1798. (Gr., " good + little one.") 



Very small black or piceous shining beetles having the labrum 

 short, rounded in front; antennse with joints 4-8 small, gradually 

 broader, 9-11 forming an 



oblong rather loose club. 

 They occur beneath bark 

 or in fungi and are more 

 or less contractile, some of 

 them having the power to 

 roll themselves into a very 

 convex rounded mass, with 

 the legs bent under and 

 completely hidden. Three species have been taken in Indiana, while 

 another probably occurs. 



Fig. 144. a, Agathidium oniscoides; b, upper, same, contracted; 

 lower, A. politum_(male) contracted ;_c, Aglyptus Icevis; a, antenna 

 of same. 



KEY TO INDIANA SPECIES OF AGATHIDIUM. 



a. Mesosternum continuous on the same plane with the metasternum, mod- 

 erately separating the middle coxse and subcarinate in front ; elytra 

 polished, without punctures; third joint of antennae longer than sec- 

 ond. 



&. Larger species ; sutural stria? very fine. 563.' oniscoides. 



1)1). Smaller species ; sutural stria? distinctly impressed. 



564. EXIGUUM. 



a a. Mesosternum vertical between the coxee, which it narrowly separates, 

 not carinate in front ; hind angles of thorax broadly rounded ; body 

 very convex and contractile. 



