THE DARKLING BEETLES. 1245 



present than absent and the tarsi are pubescent beneath. Nine of 

 the 17 tribes recognized by LeConte and Horn are known to be 

 r< -presented in the State. 



KEY TU INDIANA TKIBKS OF 'I'KNKUKIONl N.K. 



a. Front dt' head entirely corneous or horn-like in texture, never hinged 



with a leather-like clypeus. 

 b. Tarsi not compressed, their first joint moderate or elongate, never 



very short ; cheeks not sulcate. 

 <: Eyes less iirominent than the sides of front, more or less Irans- 



verse, always emarginate in front. 

 <1. Next to last joint of tarsi entire. 



c. Front coxa' rounded; middle coxa- with trochantin ; antenna; 



with third joint usually longer than those following. 

 /'. Front feebly dilated at the sides; tarsi with silken pubes- 

 cence beneath ; form elongate, rather slender ; size large, 

 usually 12 or more mm. 



Tribe I. TKM-T.KIOM M. ]>. llM.~>. 



//. Front broadly dilated at sides, emarginate In front; front 

 tarsi of male dilated; form short, oval; smaller 6-10 mm. 



Tribe II. I'HM.viM. p. 1251. 



cc. I'" roil I coxa* subtransverse ; middle coxa- without trochantin; 

 third joint of antenna? short: tarsi pubescent, the last joint 

 long; form oval or elongate; length less than 12 nun. 



Tribe III. UI.OMIM. p. 1253. 



ilil. Next to last joint of tarsi bilobed; surface coarsely punctured: 

 lergth less than U mm. Tribe IV. HKTKUOT \KSIM, p. 1258. 



cc. Eyes more prominent than the sides of front, usually rounded, fee- 

 bly or not emarginate; form usually oval or rounded, convex; 

 length less than 7 mm. Tribe V. PIAPERINI, p. 12GO. 



lil>. Tarsi compressed, their first joint short; cheeks sulcate; surface very 

 rough. Tribe VI. BOLKTOPHAGINI, p. 12<iti. 



</(/. Front with a coriaceous or leather-like margin, or a coriaceous band 



between it and the labrum ; third joint of antenna 1 long. 

 //. Sides of front not obliquely elevated: abdomen not pedunculate; 

 outer joints of antenna; broader; head not deflexed. 



Tribe VII. MELOPINI, p. 12i;s. 

 ////. Sides of front obliquely elevated. 



//. Inner wings wanting; metasternum very short; body robust, con- 

 vex. Tribe VIIT. MERAC ANTHINT. p. 12i<.i. 

 lili. Inner wings present; metastenmm long; body slender. 



Tribe IX. Si KONCY I.HM. p. 1270. 



Tribe I. TEXEBRIONIXI. 



Rather elongate, uniform Mack or piceous species of medium or 

 large size, having the head prolonged, but scarcely narrowed behind, 



