134 MEMOIRS ON THE COLEOPTERA 



in probus, with the sides in the form of thin vertical wings; the 

 antennae also are much longer. 



Pterostichus erebeus n. sp. Much smaller, more slender and very 

 much less convex, similar in color and in the polished lustre, except that 

 the tarsi also are black; head nearly similar, the labrum less transverse; 

 antennae shorter, the tenth joint a little less than twice as long as wide; 

 prothorax but slightly wider than long, the sides almost evenly rounded 

 from apex to base, more converging basally, the angles very broadly 

 rounded, almost obliterated; base feebly sinuate medially and arcuate 

 laterally, nearly four-fifths the maximum width; surface with feeble 

 transverse wavy lines, strongly and deeply margined and reflexed at the 

 sides, deeply striate along the middle, the basal impressions completely 

 fused, forming a deep elongate-oval cavity, which is rugulose at the 

 bottom, the carina strong but short, converging toward the edge pos- 

 teriorly as in adjunctus; elytra oblong, rounded parabolically at tip, 

 parallel, with very feebly arcuate sides, only very moderately convex, 

 three-fifths longer than wide, nearly a third wider than the prothorax, 

 the striae deep, impunctate, the scutellar long and deep, joining the first 

 as in the preceding and coracinus and perfectly continuous with the first 

 stria, the basal part of which is detached; intervals very strongly convex; 

 tarsi moderately long and slender. Length ( 9 ) 14.0 mm. ; width 4.8 mm. 

 Wisconsin (Bay field), Wickham. 



Allied to coracinus but very much smaller and differing also in 

 the narrower form, much more flattened upper surface, still more 

 broadly rounded thoracic angles and shorter, though strongly 

 developed, carina. From adjunctus Lee., which I believe to be valid, 

 it differs in the broadly rounded basal thoracic angles, narrower 

 and less convex form, smaller size and many other features. 



Pterostichus vapidus n. sp. Oblong-oval, rather strongly convex, 

 deep black and polished throughout, the tarsi piceous; head fully three- 

 fifths as wide as the prothorax, the impressions rather deep and broadly 

 concave; labrum truncate, with the angles rounded; tenth antennal joint 

 (cf ) twice as long as wide, the antennae brown as usual; prothorax a 

 fifth wider than long, nearly as in coracinus, but with the hind angles 

 more rounded, the broadly confluent impressions forming a pit, punctured 

 but with the central parts slightly convex, the carina almost similar; 

 elytra very short, oval, two-fifths longer than wide, a third wider than 

 the prothorax, the sides strongly arcuate; striae deep, completely im- 

 punctate, the scutellar long and deep, joining the first without interrupt- 

 in,g the latter; intervals convex; tarsi very slender. Length (cf) 12.5 mm.; 

 width 4.8 mm. New York (Adirondack Mts.), Prof. Kemp. 



The left side of the prothorax at base, in the unique type, is 

 distorted, the setigerous fovea in the hind angle being greatly en- 

 larged, and the elytral striae are distorted and irregular internally 



