STENUS. 293 



finely punctured. L. 2 1. Not unconnnon. S. acmulus, Er. 



C C Thorax with a distinct ol)li([UC impression 

 on each side of disc beliind middle. 



a (I. Elytra nearly half as long again as thorax. 



Black, scantily pubescent. Frontal furrows deep ; an- 

 tennae short, third joint distinctly longer than fourth ; 

 thorax a little broader than long; elytra nearly half as 

 long again as thorax, punctuation close and rather strong ; 

 al)domen short, moderately closely and finely punctured. 

 L. 1 — 1^1. Common. S. p^lsill^cs, Stei^h.. 



h b. Elytra scarcely longer than thorax. 



Similar to S. piisillus, but with thorax not so flat, rather 

 more shiny and less closely punctured, with depressions 

 feebler ; elytra shorter, not quite so flat, rather more 

 strongly and not quite so closely punctured and more con- 

 tracted at shoulders. L. 1 — 1-^ 1. Scarce. S. exiguus, Er. 



2, Legs at least partly yellow-brown or red-brown. 



A A. Third joint of antennae half as long again 

 as fourth ; length 2\ — 2| lines. 



a a. Maxillary palpi yellow, at most with 

 brown apex. 



A a. Antennae red-brown, with first two 

 joints blackish ; legs reddish-yellow, with 

 knees blackish and tarsi brownish. 



Black, dull ; palpi entirely yellow. Frontal furrows 

 rather sharp ; thorax distinctly longer than broad, with 

 distinct traces behind of a central furrow. Punctuation 

 very close. L. 2| 1. Common. >S^. speculator, Lac. 



jB b. Antennae blackish-brown; legs reddish- 

 yeUow, with apex of femora (to a larger 

 extent than in S. speculator), base and apex 

 of tibiae and tarsi brownish-black. 



Black, dull ; apex of palpi brown. A little more slender 

 and convex than S. speculator, frontal furrows a little deeper, 

 central furrow on thorax distinct, punctuation of fore parts 

 rather stronger and not quite so close, that of abdomen 

 rather finer and more difluse. L. 2| 1. Common. 



aS'. providus, Er. 



The variety Boyeri, Kr. has the elytra, which in providios 



