406 FAMILY XI. STAPHYLINTD^E. 



yg. Elytral suture longer than thorax, 

 /i. Species 3 nun. or more in length. 



/. Longitudinal elevation between (lie eyes indistinct or nearly 



obsolete ; length .'! nun. 



./'. Thorax with median impression very feeble, extending 

 nearly the entire length. VICINUS. 



/'/. Thorax with median impression reduced to a simple ero- 

 sion just behind the middle. INGRATUS. 

 //. Longitudinal elevation distinct; head wider than elytra at 

 base ; length 3.3 mm. 785. SCABIOSUS. 

 lih. Species less than 3 mm. in length. 



/,-. Thorax widest distinctly before the middle. 



/. Legs black ; length 2.6-3 mm. INORNATUS. 



//. Legs fuscous ; length 2.5-2.7 mm. PLACIDUS. 



A'A-. Thorax widest at or behind the middle ; length 2.4-2.6 mm. 



EBIENSIS. 

 >ni. Minute species, length less than 2 mm. 



tit. Transverse carinse of abdomen without cusps; length 1.7-1.9 mm. 



NANUS. 



iiini: Transverse cariiue with three cusps; form much more slender; length 

 1.7 mm. puMirjo. 



783 (2321). STENUS STRANGULATES Casey, Rev. Sten., 1884, 39. 



Elongate, very slender. Black, shining, very sparsely and finely pubes- 

 cent; antenna? piceous, palpi paler; legs uniform dull reddish-brown. Head 

 nearly twice as wide as long; surface between the eyes deeply excavate, 

 finely and rather sparsely punctate, with two grooves and a median con- 

 vex ridge. Thorax widest before the middle, slightly longer than wide, 

 coarsely and irregularly punctate, the median impression rather wide and 

 shallow, extending two-thirds the length of disk. Elytra at base two-thirds 

 the width of head ; coarsely and irregularly punctate. Abdomen long, feebly 

 tapering, coarsely and sparsely punctate. Length 3-3.5 mm. 



Lake County ; rare. May 2. Known heretofore from New 

 York and Detroit. 



784 (2328). STENUS ERYTHROPUS Melsh., Proc. Phil. Acad. Nat- Sci., II. 



1844. 40. 



Rather robust. Black, shining, sparsely clothed with short, tine gray- 

 ish pubescence ; antenna? piceous, palpi and legs piceous-brown. Head be- 

 tween the eyes distinctly excavate, coarsely, closely and evenly punctate, 

 the median ridge low and subnbsolete. Antennae longer than width of head, 

 the third joint one-third longer than fourth. Thorax very robust, widest at 

 middle, coarsely, closely and unevenly punctate and with a rather narrow 

 shallow impression extending from middle two-thirds to base. Elytra 

 slightly longer than thorax, coarsely, deeply and unevenly punctate. Ab- 

 domen at base narrower than elytra, thence feebly tapering to apex, coarse- 

 ly and rather closely punctate at base, more finely toward apex. Length 

 45 mm. 



