THE GEOtJND BEETLES. 93 



125 (545). I'TEROSTICHUS CORACINUS Xewiu., Entom. Mag., 



V, ls::!8, .386. 

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

 and legs piceous. Thorax quadrate, somewhat narrowed be- 

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

 pressions broad, deep, rugosely punctured. Elytral strise 

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

 15-17.5 mm. (Fig. 58.) 



Throughout the State, frequent; more so in the 

 northern counties. May 13-October 3. Occurs be- ,J*f , 



,1 , (.Alter iiCngj. 



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 superdliasus 

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

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

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

 other respects. 



P- lachryniosus Newm. and P supcrciliostts Say, both 15 mm. 

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

 taken by Dury at Cincinnati and the latter in Michigan. 



126 (.546). Pterostichds stygicus Say, Trans. Amer. Phil. Soc, II, 182.S, 



41 ; ibid. II, 407. 

 Closely allied to the preceding. Distinguished principally by the small 

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

 Elytral intervals more convex. Length 14-16 mm. 



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

 woods. ]\Iarch 31-Oetober 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). Ptekostichus relictus Xewm., Entom. Mag., Y, 1838, 387. 

 Resembles both cdnichtiis and sti/i/iciis. Thorax longer, more distinctly 



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

 pressions, the latter, therefore, being single. Elytral stri.-e deeper, with 

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



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

 September IS. Occurs beneath stones in deep ravines. 



