50. 



Differs from Pterostichus § 3, G, (Omaseus), chiefly by the prothor- 

 ax more strongly margined, hind angles not carinate and by the ligula 

 being obtusely carinated for its whole length; the last character being the 

 only one which for convenience may be assumed to have generic value. 

 (Leconte, Proc. Ac. Phil. 1873, page 316.) 



A. Hind angles of prothorax rectangular, sides sinuate towards the base; mid- 



dle tibia; of <J' armed with a subapical tooth on the inner side, more or less dis- 

 tinct, and an apical process. 

 a- d* 9 not ver y brilliant, elytra of § dull. 



Larger, sides of prothorax scarcely sinuate behind; middle tibiae of $ with an acute, 

 apical process, and obsolete subapical tooth. 1. Hal&emani Lee. 



Large, sides of prothorax distinctly sinuate towards the base ; middle tibiae of^f with 

 an obtuse subapical tooth, and a large acute apical process, complanata, Dej. 



2. tartaricus Say. 



b. rj Q moderately and equally brilliant; sides of prothorax distinctly sinuate behind ; 

 middle tibiae r£ with an acute subapical tooth, apical process wanting. 



3. strenuus Lee 



f-rfQvery brilliant, as if varnished; sides of prothorax distinctly but less strongly sin- 

 uate, middle tibiae of male with acute subapical tooth and feeble obtuse apical 

 process, a. Hind angles of prothorax less prominent, canadensis Chaud. 



1 scrutator Lee. 



B. Hind angles of prothorax obtuse, sides more widely reflexed behind; elytra rj 1 dull. 



middle tibiae without subapical tooth and but feeble apical process. 5 gravis Lee. 



BIBLIOGRAPHY. 



1 . HaldetnUni, Lee. Ann. Lye. IV. 241 Ala. — 22 mm. 



2. tartaricus, Say. Trans. Am. Phil. II, 44. South — 2omm.=co;np/anati/s, Dej. Spec. 



Ill, 281. 



3. strenuus, Lee. Joum. Ac. Phil. II, 249. N. Y. — 20 mm. 



4. scrutator, Lee. Ann. Lye. IV, 242. Can. — 15 mm.=cariad;nsis, Chd. 



5. gravis, Lee. Proc. Ac. Phil. 1873. p. 316. Pa? —19 mm. 



HOLCIOPHROUS, 



(Synoptic table by Horn.) 



Thorax much narrowed to base. 



Last ventral segment of <$ with strong carina 1, ater. 



Thorax nearly square. 



Last ventral segment of <$ obtusely carinate 2. serripes. 



BIBLIOGRAPHY. 



1. Hole, ater, Dej. Spec. Ill, 339. Cal. Or. Wash Terr. — 22-28 mm. 



2. serripes, Lee. Trans. Am, Ent. Soc. V, 169. Cal. — 15. 3-18 mm. 



