STENUS. 295 



moderately fine ; elytra rather convex. Fourth tarsal joint 

 heart-shaped. L. 1} 1. Not uncommon. ;S'. argus, Gr. 



b b. Legs entirely red-brown or red-yellow. 



A (I. Elytra as long as, or slightly longer 

 than thorax. 



A 1, Abdomen rather broadly bordered, 

 finely and not very closely punctured. 



Black ; rather shiny; palpi brown, with first joint yellow ; 

 antennae brownish-black, third joint scarcely longer than 

 fourth. Thorax as long as broad. L. 1^ 1. Eather com- 

 mon. S. vafellus, Er. 



li 1, Abdomen finely bordered, mode- 

 rately closely, rather strongly punctured. 



Convex. Black, rather shiny ; palpi brown, with first 

 joint yellow ; antennae brownish, third joint distinctly 

 longer than fourth. Thorax distinctly longer than broad. 

 L. 11 — -1^ 1. Common. S. fuscipes, Gr. 



B b. Elytra half as long again as thorax. 



Black, rather dull ; palpi reddish-yellow; antennae brown, 

 club only darker, third joint rather longer than fourth. 

 Frontal furrows wide and shallow ; thorax distinctly broader 

 than long. L. 1 — 1^ 1. Not uncommon. S. circularis, Gr. 



c c. Legs red-brown, with knees blackish. 



Black, slightly shiny ; palpi brownish-yellow, with third 

 joint blackish ; antennae pitch-black, third joint rather 

 longer than fourth. Frontal furrows deep ; thorax scarcely 

 broader than long. L. 1-^ 1. Common. S. declaratus, Er. 



b. Abdomen not bordered. 



I. Abdomen with four ridges (intermediate ones more 

 distinct) in middle of base of second, third and 

 fourth dorsal segments. 



1, First joint of posterior tarsi twice as long as 

 second. 

 Black, with slight leaden reflection, rather shiny ; first 

 joint of palpi yellow-brown ; antennae and legs black, 

 tarsi rather elongate. Forehead with shallow furrows, in- 

 terstice convex ; thorax broadest before middle ; abdomen 

 short, diffusely punctured. L. 1|- — If 1. Common. 



S. CTCtssiventris, Th. 



