THE (JAEEION BEETLES. 289 



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

 irregularly punctate, sometimes with larger i>unctures forming sinuous rows 

 near the sides and suture, lllud 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 (1702). Cyrtusa egena Lee, Proc. Phil. Acad. Nat. Sci., 18.53, 2s4. 



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 tlat, 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 eon- 

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

 Detroit, Michigan, and the District of Columbia. 



XIII. Agathidium Illig. 1798. (Gr., " good -^ little one.") 



Very small black or piceous shining beetles having the labrum 

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

 broader, 9-11 forming an 



oblong rather loose club. 



They occur beneath bark f 



or in fungi and are more 



or less contractile, some of 



them having the power to 



roll themselves into a very ■* ^l'^" .:>3='^«Kt> 



convex rounded mass, with Fig. 144. a, AgatUdlum miscoMes; b, upper, same, contracted; 

 T - , , T T ' [lower, A. polUum (male) contracted; Cy-Aglyptua Ixvis; a, antenna 



the legs bent under and j [of same. 



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



another probably occurs. 



KEY TO INDIANA SPECIES OF AGATHIDIUM. 



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

 erately separating the middle coxae and subcarinate in front; elytra 

 polished, without jranctures; third joint of antennse longer than sec- 

 ond. 

 6. Larger species ; sutural strife very fine. 563. oniscoides. 



66. Smaller species; sutural striae distinctly impressed. 



564. EXIGUDM. 



aa. Mesosternum vertical between the coxas, which it narrowly separates, 

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

 very convex and contractile. 



