THE ANT-LIKE STONE BEETLES. 



298 



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

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

 tip; scutellum large and distinct; prosternum very short and 

 deeply emarginate before the coxa?. 



Tribe IV. Cepheniini, p. 302. 

 ec. 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 coxa?. 



Tribe V. Eutheiini, p. 303. 

 del, Hind coxa? oval, not reaching the sides of body; antenna? inserted 

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

 hind trochantins elongate; pygidium vertical or greatly inclined. 



Tribe VI. Eumickini, p. 303. 



Tribe I. EUCONNINI. 



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 INDIANA GENERA OF EUCONNINI. 



a. Thorax with two or more fovea? near the basal margin. 



&. Third joint of maxillary palpi obconic. gradually narrowed toward 

 base; antennal club three- or four-jointed. I. Euconnus. 



bb. Third joint very slender, abruptly clavate in front of middle; body 

 glabrous; head large; antennal club four-jointed. 



II. Pycnophus. 



aa. Thorax without fovea?, 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 foveas or pits near 

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

 while two others may occur. 



KEY TO INDIANA SPECIES OF EUCONNUS. 



a. Antennal club four-jointed. 



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

 cent ; clypeus separated from the front by a fine suture, 

 c. Head much narrower than thorax ; secondary sexual characters of 

 male on third and fourth ventral segments. 

 d. Carina on side of thorax visible only at base; secondary male 

 characters large and conspicuous ; piceous, the disk of elytra 

 reddish. 568. clavtpes. 



dd. Carina on side of thorax long and distinct; secondary male char- 

 acters feeble; black, elytra red. 569. semiruber. 



