406 FAMILY XI. STAPIIYIJNTD^. 



gg. Elytral suture longer than thorax. 

 //.. Species 3 mm. or more in length. 



7. Longitudinal elevation between the eyes incUstinet or nearl,^• 

 obsolete ; length :'> mm. 

 j. Thorax with median impression very feeble, extending 

 nearly the entire length. vioinds. 



jj. Thorax with median impression reduced to a simple ero- 

 sion just behind the middle. ingbatus. 

 ii. Longitudinal elevation distinct; head wider than elytra at 

 base ; length 3.3 mm. 785. scabiostjs. 

 lih. Species less than 3 mm. In length. 



li. Thorax widest distinctly before the middle. 



I. Legs black; length 2.6-3 mm. inoenatus. 



U. Legs fuscous ; length 2.5-2.7 mm. plaoidus. 



7c7i-. Thorax widest at or behind the middle ; length 2.4r-2.6 mm. 



EBIENSIS. 



ail. Minute species, length less than 2 mm. 



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



NANUS. 



linn. Transverse carln» with three cusps; form much more slender; length 

 1.7 mm. PUMIIJO. 



783 (2321). STENtrs steangulatds Casey, Rev. Sten., 1884, 39. 



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

 cent ; antenntE plceous, 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; ra,re. May 2. Known heretofore from New 

 York and Detroit. 



784 (2328). Stenus ekythkopus Melsh., Proc. -Phil. Acad. Nat. Sci., II, 



1844, 40. 



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

 ish pubescence; antennae piceous, palpi and legs plceous-brown. Head be- 

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

 the median ridge low and subobsolete. 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 anil rather closely punctate at base, more finely toward apex. Length 

 4-5 mm. 



