THE ANT-LOVING BEETLES. 325 



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

 tennae. 

 (?. Vertex more or less scabrous or roughened and carinate. 



c. Vertex vaulted or elevated, feebly scabrous; last anteuual joint 

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

 ders not angulate ; length 1.5 mm. 017. RTPARIUS. 

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



male without a tooth; length 2.1* mm. 



/'. Fovea- of occiput not pubescent; frontal margin of male 



notched in middle; shoulders angulate. SCABRICEPS. 



ff. 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. IINEATICOLLTS. 



<1<1. Vertex smooth; front more or less elevated. 



{j. 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. FUOXTALIS. 

 Jili. Thorax with four basal spines; snlcus of vertex shallow; 

 elytra very finely and sparsely punctate; length 1.9 mm. 



SIMPLEX. 



gg. Antenna 1 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. 61S. GLOBOSUS. 



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



antenna?; tenth antennal joint of male very large. 

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



./. Keddish-brown : tenth joint in male with a small fovea at the 



base; length 1' mm. 010. VIRGIXI.E. 



././. Black or piceous ; antenna: 1 and legs red; tenth joint foveate 



on under side. 

 /,-. Median sulcus of thorax obsolete; length 1.0 mm. 



620. SPBE1TS. 



/,/,-. Median sulcus present: fovea- on under surface of tenth 

 joint very large. G21. FOVEICORXIS. 



//. Ilumeri spinous : fovea of occiput pubescent: length 2 mm. 



7. Basal joint of male antenna^ bluntly toothed below; tenth j lim 

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

 side. HENTICOLLIS. 



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

 neath : black, with reddish antenna' and legs. 



in. Flytra smooth, vertex not punctate; third j lint of male an- 

 tenna 1 longer than second or fourth and swollen on one 

 side. 022. NioRiCANs. 



nun. Flytra indistinctly punctate; vertex with a central trans- 

 verse puncture; three basal joints of antenna 1 suboqually 

 decreasing in size. STRIATUS. 



