404 



FAjVULY XI. STAPHYLIXID^. 



cc. Median impression of thorax beginning behind middle, wider, much 

 more shallow and inconspicuous; elytral surface much less chan- 

 neled, the punctures distinct over a great part of their area; fifth 

 segment of male not notched at apex. 782. similiattts. 



780 (2311). Stenus jtjno Fab., Syst. Eleut, II. 1801, 602. 



Elongate, robust. Black, shining, very finely and sparsely pubescent; 

 antennae, palpi, tibia? and tarsi piceous. Head scarcely twice as wide as 

 long, the front coarsely punctate, with a deep groove each side, separated 

 by a strongly convex ridge. Thorax subcylindrical. slightly longer than 

 wide, widest at middle; coarsely, closely and evenly punctate, the punc- 

 tures confluent near base and apex ; the median impressed line very faint, 

 two-thirds the length of disk. Elytra coarsely, deeply and densely punc- 

 tured and channeled, the spiral on the side just behind middle. Abdomen 

 one-third narrower than elytra, deeply and rather sparsely punctate, the 

 first four dorsal segments deeply impressed at base, their transverse carina? 

 with three cusps projecting backward. Length 4.5 mm. 



Lake. Vigo and Posey counties ; frequent in Lake, scarce in the 

 others. March 26-July 1. Taken from beneath rubbish on the 

 beach of Lake Michigan and from under logs on wooded hillsides 

 in the southern counties. 



S. austini Casey, 3.5-3.8 mm. in length, a member of the boreal 

 fauna, ranges from New Hampshire to Lake Superior and probably 

 occurs in northern Indiana. 



781 (2319). Stenus femokatts Say. Trans. Amer. Phil. Soc, IV. 1834. 



459 ; ibid. II. 574. 



Short, rather robust. Black, shining, clothed with short and sparse sub- 

 erect pubescence, orange-yellow on the abdomen, grayish elsewhere; legs 

 dusky yellow, the femora darker at apex. Head more than twice as wide 

 as long, surface between the eyes concave, finely and densely punctate and 

 with a median ridge : antennae reaching middle of thorax, piceous. the third 

 joint less than one-half longer than the fourth. Thorax finely, closely and 

 irregularly punctate and with a narrow, deep impression on median third. 

 Elytra densely and irregularly punctate, the punctures united into channels 

 over most of the surface, the spiral behind the middle. Abdomen narrower 

 at base than elytra, thence distinctly tnpering to apex; finely and densely 

 punctate, the transverse carina? with three cusps. Length 3.5-4 mm. 



Marion County; scarce. April 4-April 24. Probably occurs 



throughout the State. 



782 ( ). Stenus stmii.tatus sp. nov. 



Short, robust. Black, shining, very finely and sparsely pubescent; an- 

 tenna? piceous ; legs reddish, the femora darker at tips. Head twice as wide 

 as long, surface between the eyes feebly concave, its median portion slightly 

 convex, rather coarsely and closely punctate. Thorax slightly longer than 

 wide, widest at middle; coarsely and closely punctate and with a shallow 

 impression on basal half. Elytra as long as wide, one-fifth longer than 



