STAPHYLINID^E 191 



late, thence more decidedly converging posteriorly, becoming feebly 

 sinuate before the distinct basal angles, the surface unimpressed; elytra 

 nearly similar in form and sculpture but not at all wider than the pro- 

 thorax, the suture two-fifths longer; abdomen parallel, only very little 

 narrower than the elytra, the fifth tergite (cf ) with a small and feebly 

 elevated elongate tubercle just behind the centre, the sixth evenly 

 sinuato-truncate and serrulate at apex, the serrules increasing slightly 

 and gradually in size laterally. Length 2.4 mm.; width 0.55 mm. 

 Iowa (Cedar Rapids), Brendel. 



Closely allied to the preceding but differing in its shorter and 

 broader prothorax, which is not at all narrower than the elytra, 

 in its relatively somewhat broader abdomen and in the evidently 

 slighter convexity of the upper surface. 



Silusa senescans n. sp. Stouter, only moderately convex, parallel, 

 black or piceous-black, the elytra only very slightly paler, the legs pale 

 luteo-piceous; lustre dull, the ground sculpture fine but strong, regular, 

 the punctures sparser and shallow on the head, fine, asperate and rather 

 close on the pronotum, larger, close and asperate but not coarse on the 

 elytra, fine, close and asperate on the slightly more shining abdomen, a 

 little sparser posteriorly, the three impressions scarcely at all punctate 

 and distinctly decreasing in depth, the third very moderate; pubescence 

 abundant, coarse and pale, yellowish; head distinctly transverse, two- 

 thirds as wide as the prothorax, the eyes moderate, rather prominent, 

 at two-thirds their length from the base, the tempora moderately con- 

 verging and feebly arcuate to the base; antennae black, piceous basally. 

 moderate in length, thick except basally, the third joint a little longer 

 than the second and almost as long as the first, fourth transversely 

 obtrapezoidal, not much thicker, fifth abruptly much thicker and thence 

 increasing feebly to the tip, the tenth twice as wide as long, the last 

 rather acutely ogival, somewhat longer than the two preceding; pro- 

 thorax not quite twice as wide as long, parallel, widest at the middle, the 

 sides evenly and strongly arcuate, the basal angles obtuse and slightly 

 blunt, the surface with a feeble transverse ante-scutellar impression; 

 elytra but slightly transverse, subparallel, scarcely visibly wider, the 

 suture two-fifths longer, than the prothorax, the apical sinuses small 

 but rather deep; abdomen not quite so wide as the elytra, parallel and 

 straight at the sides, the first five tergites equal in length; basal joint 

 of the hind tarsi scarcely one-half longer than the second, two to four 

 equal and together equal to the fifth. Length 2.65 mm. width 0.7 mm. 

 Iowa (Cedar Rapids), Brendel. 



Quite different from either of the two preceding in coloration, 

 antennal structure, form of the prothorax and in many other fea- 

 tures; the type is a female. 



