2S4 FAMILY VIII. — SILI'IIID^E. 



Thorax one-half wider than long, sides feeljly curved, hind angles obtusely 

 rounded; dislv coarsely and very denselj- punctate. Elytra as wide at base 

 u,s thorax, thence feebly tapering to apex, sides nearly straight ; disk dense- 

 ly, fiiu'ly and rather roughly punctate. JIale with three joints of front 

 tarsi broadly dilated, middle tibiiB strongly curved, hind ones straight. 

 Length 2.5 mm. 



Clark and Posey counties ; scarce. April 21-]\Iay 6. Taken by 

 sifting'. 



Tribe IV. ANI.SOTOMIXI. 



This tribe comprises species of small size, having the body oval, 

 convex, sometimes capable of being contracted into a hemispherical 

 ball; front cox;e conical, contiguous, prominent, with trochantin, 

 the coxal cavities narrowly closed behind; hind coxeb contiguous; 

 abdomen with six segments. They live for the most part either in 

 decomposing fungi or under the bark of dead trees. Seven genera 

 are known to be represented in Indiana, while two others may 

 occur. 



KEY TO IXDIANA (;l•;^'EBA OF .■i>;iS0T0MI.\I. 



«. Head without antennal grooves beneath. 



h. Hind tarsi flve-jointed; mesnsternum not carinate ; antennal club flve- 



jOiuted. IIYDNOBIUS. 



hh. Hind tarsi with less than five joints: luesusternuni carinate. 



c. Antennal club flve-jointed ; length 2.5^ mm. ^'II1. Anisotoma. 

 cc. Antennal club three-jointed, elongate, lu.ise; smaller, not over - 

 mm. ; elytra \-\'ith fine transverse A\'rinkles. IX. Coi.exis. 



(/(/. Head with distinctly limited antennal gr.:<ives. 

 .7. Antennal club more than three-jointed. 



1. Anteimal club five-jointed, elongate. (Fig. 4. Xn. 0.) 



f. Form bri.aiUy oval or hemispherical, convex; frontal suture well 

 marked ; tarsi unlike in the sexes, prosternum short in front 

 of co.ve. X. LiODES. 



ff. l-'orm oblniig-elliptieal, sulidepressed ; frontal suture wholly lack- 

 ing; iiriisternum long before tlie coxte. XI. Stethouodes. 

 cc. Antennal club four-jointed; number of tarsal joints the same in 

 liiith sexes. XII. Oyrtusa. 

 (Ul. .\ntennal chi!) three-jointed; tarsi unlike in the sexes. 



</. Antenna' ten-jointed. Isopl.\sti.s. 



yg. Antenme cle\en-jointed. 



h. Hind tarsi four-jointed; mesosternum not carinate between the 

 middle coxa'; body strongly contractile. 



XIII. Aoathidh'm. 

 hh. Iliud tarsi three-jointed ; mesosternum sti-ongly carinate. 



XIV. Aglyptis. 



