THE AXT-LIKE STONE BEETLES. 293 



c. Head deeply inserted and strongly deflexed, the neck invisible; 

 eyes basal, frequently wunting; elytra more or less rounded at 

 tip ; seutelhini large and distinct ; prosternum very sb(jrt and 

 deeply emarginate before the coxiv. 



Tribe IV. Cepheniini, p. 302. 

 er. Head exserted and but feebly inclined, the neck exposed and con- 

 stricted ; eyes sub-basal: third palpal joint obconic; prosternum 

 rather long and well developed before the coxae. 



Tribe V. Eutheiini, p. .303. 

 d(l. Hind cox® oval, not reaching the sides of body; antennae inserted 

 close together at the apex of the front ; neck strongly constricted ; 

 hind trochantins elongate; pygidium vertical or greatly inclined. 



Ti'ibe VI. Edmicrini, p. 303. 



Tribe I. BUCONNINI. 



The special characters of this tribe are set forth in the above 

 table. Three of the six genera recognized by Casey are represented 

 in the State. 



KEY TO IlNPEANA GENEKA OF El'fONNINI. 



a. Thorax with two or more fove:e near the b;isal margin. 



6. Third joint of maxillary palpi obconic, gradually narrowed toward 

 base; antennal clulj three- or four-jointed. I. Euconkus. 



bh. Third joint very slender, abruptly clivate in front of middle; b )dy 

 glabrous; head large; antennal club four-jointed. 



II. Pycnophus. 



iia. Thorax without fnveiv. though often more or less transversely impressed 



near base, conical in form and never narrowed at base nor carinate 



near hind angles. III. Connophron. 



I. EucoNNUS Thorns. 1860. (Gr., "to know well,") 



Head exserted, the eyes in front of middle; thorax oblong, more 

 or less narrowed at base and with at least two fovese or pits near 

 the hind margin. Six species have been recognized from the State, 

 while two others may occur. 



KEY TO INDIANA SPECIES OF El CONNU.S. 



a. Antennal club four-jointed. 



6. Elytra with long, erect and very sparse hairs ; head sparsely pubes- 

 cent ; elypeus separated from the front by a fine suture. 

 c. Head much narrower than thorax ; seciind:iry sexual characters of 

 male on third and fourth ventral segments. 

 (1. Carina on side of thorax visible only at base; sei'ondary male 

 characters large and coiisi)icuous; piceous, the disk of elytra 

 reddish. 568. clavipes. 



ihl. farina on side of thorax long and distinct; see ludary male char- 

 acters feeble; black, elytra red. 5i:n. semibuber. 



