408 



FAMILY XI. STAPH YLINIIXZE . 



dd. Elytra! suture much longer than thorax ; head not wider than ely- 

 tra ; legs piceous ; length 2.6 mm. animatus. 

 (7(7. Transverse carinas without cusps; thorax with a narrow elevated longi- 

 tudinal carina on its basal half ; length 2.3-2.8 mm. carinicollis. 



786 (2376). Stenus colonus Erichs.. Gen. Spec. Staph., 1840, 699. 

 Rather slender. Black, shining, sparsely clothed with fine gray pubes- 

 cence; legs black; antennas and tarsi brownish. Head less than twice as 

 wide as long, surface between the eyes flat, finely and densely punctate. 

 Antennae short, not longer than width of head; third joint less than one- 

 half longer than fourth. Thorax subcylindrical, widest slightly behind the 

 middle, finely and densely punctate. Elytra one-sixth longer than thorax, 

 about as wide at base as head, coarsely, densely and irregularly punctate. 

 Abdomen slightly narrower at base than elytra, thence distinctly tapering 

 to apex, finely and rather closely punctate. Length 3-3.4 mm. 



Lawrence County; rare. May 23. 



787 ( — — ). Stenus suspectus sp. nov. 



Rather robust. Black, feebly shining, sparsely clothed with fine gray 

 hairs ; femora black ; antennas, tibiae and tarsi piceous. Head one-half 

 wider than long, coarsely and closely punctate. Antennas reaching middle 

 of thorax, third and fourth joints subequal. Thorax narrower than head, 

 widest at middle, slightly longer than wide, coarsely, densely and roughly 

 punctate. Elytra at base one-fourth wider than thorax, punctate as there, 

 the punctures on sides in evident, irregular channels. Abdomen at base 

 slightly narrower than elytra, feebly tapering-to apex, rather finely and 

 closely punctate, the transverse carinas with four fine cusps. Length 3.5 mm. 



Lake and Vigo counties; rare. May 28-October 1. Taken be- 

 neath bark of elm. 



788 (2377). Stenus humtlts Erichs.. Col. March., 1837. 554. 



Short, rather robust. Black, strongly shining ; legs reddish-piceous. the 

 under side of femora and basal joint of palpi much paler. Head twice as 

 wide as long, surface between the eyes feebly excavate, coarsely, closely 

 and evenly punctate, the longitudinal elevation rather strongly convex. 

 Antennas dark piceous-brown. slightly longer than width of head. Thorax 

 robust, widest just behind the middle, rather finely, densely and roughly 

 punctate. Elytra at base scarcely wider than thorax at middle, rather 

 coarsely, densely and very roughly punctate. Abdomen as wide as elytra 

 at base, sides nearly parallel, surface rather coarsely and closely punctate, 

 more finely toward apex. Length 2.5-3 mm. 



Kosciusko County; scarce. June 24. Casey's mammops is said 

 to be a synonym. 



S. animatus Casey and carinicollis Casey were both described 

 from Michigan and probably inhabit northern Indiana, 



