284 FAMILY VIII. SIL 



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

 rounded; disk coarsely and very densely punctate. Elytra as wide at base 

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

 ly, finely and rather roughly punctate. Male with three joints of front 

 tarsi broadly dilated, middle tibia? strongly curved, hind ones straight. 

 Length 2.5 mm. 



Clark and Pusey counties: scarce. April 21-May 6. Taken by 

 sifting. 



Tribe IV. ANISOTOMINI. 



This tribe comprises species of small ske, 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 coxa3 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 INDIANA GENERA OF ANISOTOM1NI. 



<i. Head without autenual grooves beneath. 



l>. Hind tarsi five-jointed; mes.isternum m-t carinate; autenual club live- 

 jointed. IlYDNOBIUS. 

 1>1>. Hind tarsi with less than five juints: aiesosternuia cariuate. 



c. Antenna 1 club five-jointed; length 2.5-4 mm. VIII. ANISOTOMA. 

 re. Antenna 1 club three-jointed, elongate, louse; smaller, not over '2 

 mm. ; elytra with tine transverse wrinkles. IX. COLENIS. 



itu. Head with distinctly limited autenual grooves. 

 <l. Antennal club more than three-jointed. 



c. Antenna 1 club five-jointed, elongate. (Fig. 4. No. 0.) 



/. Fi.rm broadly oval or hemispherical, convex; frontal suture well 

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

 of coxa k . X. LIOIJES. 



/'/'. Form oblong-elliptical, subdepressed ; frontal suture wholly lack- 

 ing; prnsteruum long before the coxae. XI. STETHOLIODES. 

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

 both sexes. XII. CYRTUSA. 



'/</. Antennal club three-jointed; tarsi unlike in the sexes. 



//. Antciin.-i- ten-jointed. ISOPLASIVS. 



</.'/. Antenna; eleven-jointed. 



//. Hind tarsi four-jointed; ruesostermun not carinate between the 

 middle coxa 1 ; body strongly contractile. 



XIII. AGATHIDIUM. 

 ////. Hind tarsi three-jointed; inesosternum strongly carinate. 



XIV. AGLYPTUS. 



