246 LECONTE— SYNOPSIS OF PTEROSTICHUS. 



rounded, and the basal carina is shorter and less acute ; the impressions are very 

 obsoletely bistriate ; the posterior transverse impression is deep, 



38. P. stygicus, thorace quadrato, postice subangustato, lateribus rotundatis, angulis posticis subro- 

 tundatis, basi utrinque late foveato, punctato et bistriato, elytris bipunctatis, striis profundis impunctatis, 

 interstitiis convexis. Long. '57. 

 LeConte, Agassiz' Lake Superior, 206. 



Feronia slygica Say, Trans. Am. Phil. Soc. 2, 41 ; Dej. Sp. Gen. 3, 279. 

 Omaseus rvgicollis ! Hald. Proc. Ac. Nat. Sci. 1, 300. 



Lake Superior to Georgia. The basal impressions of the thorax are distinctly 

 bistriate, and the space between the strise is somewhat elevated ; the basal carina is 

 almost obsolete ; the impressions are sometimes almost smooth, sometimes densely 

 rugous and punctured. 



This is a single winged species, somewhat related to the preceding group, but yet 

 so different that I at one time considered it as a peculiar genus. The thorax is 

 narrowed behind, w'ith the posterior angles obtuse and rounded : the lateral margin 

 equally broad before and behind, strongly reflexed ; the basal impressions not deep, 

 punctured and marked with a single stria. Elytra wider than the thorax, flattened, 

 bipunctate, the anterior puncture not placed before the middle ; parapleural- long and 

 -narrow, first joint of the abdomen subimpressed, punctured. Antennae slender, mentum 

 tooth entire, obtuse, concave. The groove on the exterior margin of the posterior 

 tarsi is distinct. 



39. P. submarginatus, depressus, thorace transverso postice angustato, lateribus rotundatis, angulis 

 posticis subrotundatis, basi utrinque late foveato et punctato, elytris latioribus, striis profundis subtilitcr 

 punctatis, interstitiis subplanis, 8'° bipunetato, pedibus rufo-piceis. Long. '5. 



Feronia suhmarginata Say, Trans. Am. Phil. Soc, 2, 45 3 Dej. Sp. Gen. 3^ 309. 



Piesmus submarginatus Lee. An. Lye. 4, 341. 



Pcecilus monedula Germar, Ins. Nov. 18. 



?? Feronia 2n'ci2>es Newman, Ent. Mag. 5, 387. 



Southern States, abundant. 



This contains one apterous species of elongate form, with large head. The thorax 

 is trapezoidal, much narrowed behind, the margin wider behind and reflexed, the 

 basal impressions large and deep, without strise. Elytra wider than the thorax, striae 

 deep, third space with four punctures ; the third being on the second stria, the other 

 three on the third. Parapleurse very short : first joint of the abdomen impressed ; 

 outer tarsal grooves deep. The last ventral segment of the male is marked with a 

 wide excavation. 



