THE GROUND BEETLES. 



125 (545). Pterostichus cobacintts Newm., Entom. Mag., 



V, 1838. 386. 



Elongate-oval, rather robust. Black, shining; antennae 

 and legs piceous. Thorax quadrate, somewhat narrowed be- 

 hind, sides broadly rounded, hind angles obtuse; basal im- 

 pressions broad, deep, rugosely punctured. Elytral striae 

 deep, not punctured; intervals flat or nearly so. Length 

 15-17.5 mm. (Fig. 58.) 



Throughout the State, frequent; more so in the 

 northern counties. May 13-Oetober 3. Occurs be- ^rUng). 

 neath logs and stones in open woods. In this and the 

 next two species the side margins of thorax are wider and more 

 reflexed than in any of those preceding; the two (rarely three or 

 four) dorsal punctures are located on the second stria, one before, 

 the other behind the middle. In one specimen from Cass County 

 there are four distinct dorsal punctures on the second stria. From 

 the keys, as usually given, it was at first referred to superciliosus 

 Say. but the thorax is not narrowed behind as in that species and 

 the elytra are jet black, not purplish. I have concluded, there- 

 fore, that it is but a sport of coracinus, with which it agrees in all 

 other respects. 



P. lachrymosus Newm. and P. superciliosus Say, both 15 mm. 

 in length, very probably inhabit the State. The former has been 

 taken by Dury at Cincinnati and the la i ter in Michigan. 



126 (546). Pterostichus stygicts Say. Trans. Amer. Phil. Soc, II, 1823, 



41 ; ibid. II, 467. 



Closely allied to the preceding. Distinguished principally by the small 

 tubercle in the thoracic impressions ; carina of hind angles very short. 

 Elytral intervals more convex. Length 14-16 mm. 



Very common throughout the State beneath logs. etc.. in open 

 woods. March 31-October 20. The so-called " tubercle" is only 

 an elevated space between the two striae of the basal impression. It 

 is my opinion that a large series of specimens will show coracinus 

 to be only a form of stygicus. Say's name having priority. 



127 (547). Pterostichus relictus Newm.. Entom. Mag.. V. 1S3S, 3S7. 

 Resembles both coracinus and stygiciis. Thorax longer, more distinctly 



narrowed behind and without carina at hind angle or tubercle in basal im- 

 pressions, the latter, therefore, being single. Elytral striae deeper, with 

 narrower, much more convex intervals. Length 16-17 mm. 



Putnam. Vermillion, Vigo and Knox counties; scarce. May 25- 

 September IS. Occurs beneath stones in deep ravines. 



