328 



FAMILY X. PSELAPHIDJE. 



022 (1904) . Batrisodes nigricans Lee, Bost. Journ. Nat. Hist.. VI, 1849, 90. 



Black, shining, sparsely pubescent: antenna, palpi and legs reddish. 

 Head as long as broad, front punctate ; vertex convex, carinate. Antennae 

 with fourth joint half as wide and about as long as third; fifth to eighth 

 subequal. as wide as long; ninth longer, rounded; tenth nearly twice as 

 thick as ninth, globose; eleventh one-half longer, ovate, acute. Thorax 

 with median sulcus very deep, the basal tubercles acute; foveas on sides of 

 base pubescent. Elytra with humeri subacute, discal lines reaching middle. 

 Length 2 mm. 



Lake County; rare. May 1. 



B. striatus Lee. of which simplex Lec. is perhaps a synonym, is 

 said to occur from Massachusetts to the Missouri Eiver. 



Tribe III. EUPLECTIXI. 



In this tribe the form is more depressed and linear than in those 

 preceding, thus approaching the Staphylinida?. They have the an- 

 tenna? widely separated at base ; abdomen distinctly margined, with 

 six ventral segments; hind coxa? conical, prominent and contiguous. 

 The following genera, as limited by Casey, are probably represented 

 in the State. 



KEY TO INDIANA GENERA OF EUPLECT1NI. 



a. Tarsi with two equal claws; antenna? slender, bead-like, last three joints 

 forming a loose club ; first visible dorsal nearly as long as second and 

 without pubescent line. Rafonus. 

 aa. Tarsi with two unequal claws or with but a single claw. 



I). Antenna? elbowed, the basal joint elongate ; thorax twice as wide as 

 long, bilobed. and armed at sides wiih three inflexed spines. 



XY. Rhexius. 



hi). Antenna? straight first joint not eloDgate. 



c. Tarsi with two unequal claws, the second in the form of an ap- 

 pendage nearly one-half the length of the principal claw. 



d. Thorax with a fine entire median groove, its sides not spinous; 



body shorter, head more transverse; elytra each with four 

 basal punctures, prolonged backward by a line. 



XVI. RHExmirs. 



dd. Thorax without a median impressed line: body longer, more 

 parallel ; head less transverse. Ramecia. 

 cc. Tarsi with but a single claw, or with the second one very minute. 



e. Antennal club gradually formed, the last joint only moderate in 



size. ~ 



f. Prosternum not carinate along the middle; first dorsal not 

 longer than second. 

 g. Thorax with a central discal impression; elytra each with 

 a discal stria. 



