THE GROUND BEETLES. 95 



f. Basal impressions not or very sparsely punctured: elytra iri- 



descent, the strife fine; size larger. 14-16 mm. 



131. EBENINUS. 



f/. Basal impressions distinctly punctulate ; elytra! stria? deeper : 

 smaller, not over 11.5 mm. 132. CAUDICALIS. 



ee. Thorax less narrowed behind, the angles small, rectangular, but 

 slightly prominent, impressions punctured. 



g. Smaller, not over 10 mm. ; form slender. 133. LUCTUOSVS. 

 gg. Larger, 14-15 mm. : form broader. 134. CORVINUS. 



(Id. Hind angles of thorax not carinate, basal impressions single. 



h. Basal impressions wide and deep ; thorax strongly margined : 



ligula obtusely carinate. 



i. Size very large. 22 or more mm. ; surface but little polished. 



female dull. 135. HALDEMANI. 



U. Size smaller, not over 20 mm. ; surface polished, shining. 



j. Elytral stria? deep, distinct to apex ; surface moderately 



brilliant; size 16-20 mm. 136. TARTARICUS. 



jj. Elytral strife fine, very faint towards apex ; surface very 



brilliant: size 15 mm. 137. SCRUTATOR. 



hh. Basal impressions linear ; thorax finely margined ; ligula not 



carinate. 

 k. Color purplish; basal impressions not punctured. 



138. PURPURATUS. 



kk. Color black; basal impressions punctured. 139. MUTUS. 



cc. Dorsal punctures of elytra five or six, large, deeply impressed. 

 /. Hind angles of thorax small, dentiform ; elytra black, shining. 



140. PENNSYLVANICUS. 



II. Hind angles obtuse; elytra dark reddish-brown, feebly bronzed. 



141. LTJCZOTII. 



129 (564). PTEROSTICHUS SAYI Brulle., Silb., Rev. Entom., Ill, 277. 



Oblong, somewhat flattened. Bronzed or green above ; sometimes nearly 

 black; basal third of antenna? reddish-brown. Thorax a little wider than 

 long, feebly narrowed behind, more so in front ; margins not depressed ; 

 basal impressions deep, punctate, the outer much the shorter ; hind angles 

 rectangular. Elytral stria? deep, punctate. Length 10-12.5 mm. 



Throughout the State; common. March 19-October 20. Prob- 

 ably hibernates. 



*130 (565). PTEROSTICHUS LUCUBLANDUS Say. Trans. Amer. Phil. Soc., II. 

 1823. 55 ; ibid. I, 177 ; II, 478. 



Resembles the preceding but less flat and without the brilliant polish 

 of surface. Color exceedingly variable, usually green or bluish. Thorax 

 wider, not narrowed behind ; margin wider, more reflexed, depressed near 

 the hind angles. Elytral stria? smooth, rarely finely punctate; intervals 

 subconvex, finely alutaceous. Length 10-14 mm. (Fig. 60.) 



Very common throughout the State. February 21-September 

 22. Hibernates as imago. The dorsal punctures are usually four. 

 [723402J 



