TIII'1 CiKOUND BEETLES. 91 



l)robabl.y occur in the Stale, though but three of them have as yet 

 been taken. 



KKY Til SPECIES OK GROUP A. 



a. Elytra without a dorsal puncture. 



h. Head of moderate si/e ; thorax longer than broad, the basal impivs- 

 sions linear, single. 121. ADOXUS. 



b1>. Head very large; thorax quadrate, its basal impressions broad; hind 

 trochanters rounded at tip. ROSTRATUS. 



ua. Elytra each with one dorsal puncture behind the middle on the third 

 interval. 

 c. Basal impressions of thorax double or bistriate. 



(I. Hind angles rectangular, longer and prominent; elytral stri.-e 

 punctulate. SUBSTRIATUS. 



Ad. Hind angles subobtuse or very small ; elytral stria; not punctu- 

 late. APALACHIUS 

 co. Basal impressions of thorax single. 



e. Hind angles of thorax rounded or obtuse; larger, 10 mm.; thorax 



without an impressed line in front. 122. OBSOLETUS. 



ce. Hind angles of thorax rectangular, prominent ; elytral stria 1 



deep ; small, not over S mm. 123. HONESTUS. 



121 (519). PTEROSTICHUS ADOXUS Say, Trans. Ainer. Phil. Soc., II, 1823, 



46 ; ibid. II, 472. 



Elongate, rather slender. Black; antennae and palpi dark reddish- 

 brown; legs and abdomen piceous. Thorax widest in front of middle, 

 thence gradually narrowed to base; sides excurved near hind angles, which 

 are rectangular and denticulate; basal lines deep. Elytral striae not punc- 

 tured, intervals subcouvex. Length 13-15 mm. 



Throughout the State ; frequent. April 18-October 6. Occurs 

 beneath logs and stones on the slopes of deep wooded ravines. 



122 (532). PTEROSTICHUS OBSOLETUS Say, Trans. Amer. Phil. Soc., IV, 



1834, 424; ibid. II, 537. 



Elongate, slender, subconvex. Black or piceous, shining; antennae and 

 legs reddish-brown. Thorax orbicular, sides strongly rounded ; basal im- 

 pressions rounded, deep and small. Elytra a little wider than thorax, the 

 striae punctured, indistinctly so on sides and apex. Length 9.5-10.5 mm. 



Described from Indiana; occurs throughout the State. March 

 21-August 22. Frequent in hilly regions beneath stones and old 

 logs. 



123 (539). PTEROSTICHUS HONESTUS Say, Trans. Ainer. 



Phil. Soc., II, 1823, 51 ; ibid. II, 475. 

 Elongate-oval, subconvex. Black or piceous; antenna} 

 and legs reddish-brown. Thorax scarcely longer than 

 wide, much narrowed behind the middle and sinuate on 

 sides; basal impressions narrow and deep, with the space 

 between them coarsely and sparsely punctured. Elytra 



more oval and convex than usual, much broader than 



Fig. 57. 

 thorax, the stria? deep, not punctured. Length S mm. (After Leng). 



(Fig. 57.) 



