THE ANT-LOVING BEETLES. 



325 



c. Frontal margin produced beyond the line between the loses of an- 

 tennae. 



d. Vertex more or less scabrous or roughened and carinate. 



e. Vertex vaulted or elevated, feebly scabrous; last antennal joint 

 of male long, with an erect tooth ; elytra punctate, the shoul- 

 ders not angulate ; length 1.5 mm. 617. rtparius. 

 ce. Vertex not vaulted, coarsely scabrous; last antennal joint of 

 male without a tooth ; length 2.2 mm. 

 f. Fovea? of occiput not pubescent ; frontal margin of male 

 notched in middle ; shoulders angulate. scabriceps. 

 ft. Fovea? of occiput pubescent ; head very flat ; frontal margin 

 triangular: thorax with conspicuous discal crests and deep 

 grooves, so that the disk appears to be marked with five 



lines. LINEATICOLLIS. 



(Id. Vertex smooth ; front more or less elevated. 



g. Antenna? alike in the sexes ; fovea? of occiput pubescent ; ver- 

 tex not carinate. 



Thorax without crests or spines; sulcus of vertex deep; ely- 

 tra not punctate ; length 2.2 mm. froxtalis. 

 hh. Thorax with four basal spines: sulcus of vertex shallow: 

 elytra very finely and sparsely punctate; length 1.9 mm. 



SIMPLEX. 



gg. Antenna? unlike in the sexes, the tenth joint in male globose 

 and very large ; in female but one-half thicker than ninth ; 

 fovea? of occiput not pubescent ; vertex carinate ; length 

 1.7 mm. 618. globoses. 



cc. Frontal margin not produced beyond the line between the bases of 

 antenna? ; tenth antennal joint of male very large. 

 i. Humeri blunt, rounded; fovea? of occiput not pubescent. 

 j. Reddish-brown : tenth joint in male with a small fovea at the 

 base ; length 2 mm. 619. virgin ee. 



jj. Black or piceous ; antenna? and legs red; tenth joint foveate 

 on under side. 

 7c. Median sulcus of thorax obsolete: length 1.6 mm. 



620. SPRETES. 



Jck. Median sulcus present; fovea? on under surface of tenth 

 joint very large. 621. foveicorxis. 



ii. Humeri spinous ; fovea of occiput pubescent ; length 2 mm. 



7. Basal joint of male antenna? bluntly toothed below: tenth joint 

 large, with a small, round, deep puncture at base on under 

 side. dexticollis. 

 //. Basal joint not toothed below ; tenth joint not punctate be- 

 neath : black, with reddish antenna? and legs. 

 m. Elytra smooth, vertex not punctate; third joint of male an- 

 tenna? longer than second or fourth and swollen on one 

 side. 622. nigricans. 



mm. Elytra indistinctly punctate: vertex with a central trans- 

 verse puncture ; three basal joints of antenna? subeqiially 

 decreasing in size. striates. 



