THE PTtEDACKOTTS DTVTNT! BEETLES. 225 



KEY TO INDIANA SPECIES OF AGABUS. 



(i. Outer front tarsal claw of male elongate and dilated or thickened be- 

 neath. 



1). Elytra brownish-yellow ; length 9.5 min. ERYTHROPTERUS. 



bb. Elytra black, finely and densely reticulate ; length 6.5-7.5 min. 



436. ANTHRACINUS. 



aa. Outer front claw of moderate length, not dilated beneath. 



c. Front tarsal claws of male compressed, obtusely dentate at base. 

 (I. Elytra brownish, more or less pale; inner margin of hind tibiae 

 without punctures; prosternal spine acutely carinate along the 

 middle; length 8.5-9.5 mm. 437. CONFINIS. 



(Id. Elytra black or brassy black; inner margin of hind tibiae with a 

 row of punctures ; prosterual spine broad, nearly flat ; length 9- 

 10 mm. 438. SERIATUS. 



cc. Front tarsal claws of male simple or acutely dentate. 

 c. Front claws of male simple. 



/. Inner margin of hind tibiMe without punctures. 

 g. Prosternal spine rather narrow, convex. 



H. Elytra dark reddish-brown, very shining, without a submar- 



ginal pale stripe, their surface not coarsely reticulate; 



length 7.5-S.5 mm. 439. PUNCTATUS. 



///(. Elytra fuscous with a reddish-yellow submarginal stripe; 



their surface coarsely and unequally reticulate ; length 



8 mm. RETICULATUS. 



</!>. Prosternal spine broad, flat, polished; elytra black, each with 



a dull yellow submarginal stripe. 

 /. Broadly ovate ; under surface reddish-brown ; length 10 mm. 



440. STAGNINUS. 



ii. More narrowly ovate ; under surface black ; length 7.5-8 mm. 



OBTUSATUS. 



ff. Inner margin of hind tibire with a row of deep punctures; thorax 

 finely margined ; elytra uniform piceous, shining ; length 9 mm. 



441. GAGATES. 



cc. Outer front claw of uiaie acutely dentate near the base. 

 j. Elytra dull yellow with black stripes. 



/,-. Body beneath wholly red; first joint of middle tarsi equal to 



the next three combined ; length 9 mm. TVENIOLATIS. 



A-/,-. Meso- and metasterua and coxae black; first joint of middle 



tarsi less elongate ; length 7.5-S mm. 442. DISINTEGRATES. 



;./. Elytra not dull yellow. 



/. Elytra reddish-piceous with a greenish or brassy tinge, finely 

 pnnctulate ; length 7 mm. 443. ^ENEOLUS. 



II. Elytra black. 



m. Form broad, subdepressed ; elytra with a subapical pale 

 stripe; length S.5-9 mm. 444. SEMIVITTATUS. 



nun. Form narrow, convex; elytra without pale stripe but with 

 numerous irregular punctures; length 0-7 mm. 



445. SEMIPUNCTATUS. 



