THE SHORT-WINGED SCAVENGER BEETLES. 



413 



795 (2443). Stenus flavicornis Erichs., Gen. Spec. Staph., 1840, 733. 



Elongate, rather slender. Black, shining, sparse- 

 ly clothed with fine gray hairs. Head nearly twice 

 as wide as long, surface between the eyes feebly 

 concave, finely, closely and deeply punctate, with 

 a groove each side of a slightly convex ridge. An- 

 tennae long and slender, third joint two-thirds longer 

 than fourth. Thorax widest in front of middle, 

 slightly longer than wide, closely, rather coarsely 

 and deeply punctate. Elytra distinctly longer than 

 the width at base, punctures round, rather small 

 and deep, separated by more than twice their width. 

 Abdomen narrower than elytra, the first four seg- 

 ments equal in width, finely, closely and evenly 

 punctate. Length 4.6-4.8 mm. (Fig. 161.) 



Fig. 161. (Original.) 



Throughout the State ; common. March 13-November 28. First 

 described by Say under the name S. gemculatus, which name was 

 preoccupied. 



*796 (2444). Stenus annularis Erichs., Gen. Sp. Staph.. 1840, 735. 



Elongate, robust, subcylindrical. Black, strongly shining, sparsely clothed 

 with grayish pubescence. Head small, much less than twice as wide as 

 long, surface between the eyes nearly flat, coarsely and irregularly punc- 

 tate, convex at middle. Antennae longer than the width of head, piceous- 

 brown, the club darker, third joint two-thirds longer than fourth. Thorax 

 about as wide as long, widest just in front of middle, coarsely and irregu- 

 larly punctate, with several small smooth spaces at middle. Elytra at base 

 slightly wider than head, a little longer than thorax, punctured as in 

 flavicornis. Abdomen at base slightly narrower than elytra, thence feebly 

 tapering to apex, finely, closely and evenly punctate. Length 5-5.5 mm. 



Lake, Kosciusko. Marion and Vigo counties; scarce. January 

 7-June 25. Hibernates beneath logs and rubbish. 



797 (2451). Stenus canadensis Casey, Rev. Stem. 1884, 175. 



Elongate, rather robust. Black, shining, sparsely and finely pubescent.' 

 Head twice as wide as long ; surface between the eyes feebly convex, finely, 

 evenly and densely punctate. Antennae as long as width of head, reddish- 

 brown, the club darker; third joint one-half longer than fourth. Thorax 

 widest distinctly behind the middle, slightly longer than wide; rather 

 coarsely, densely and somewhat unevenly punctate. Elytra at base equal 

 in width to head, one-third longer than thorax; punctures round, deep, 

 evenly distributed, separated by about their own width. Abdomen as wide 

 at base as elytra, thence gradually and feebly tapering, rather coarsely, 

 densely and evenly punctate. Length 4.7-5 mm. 



Starke and Kosciusko counties; scarce. May 19-June 25. 

 Taken by beating low herbs on borders of marshes. Known from 

 Ontario and northern Illinois. 



