THE GROUND BEETLES. 99 



metathorax long; dorsal punctures three; hind tarsi with three or 

 four joints grooved on outer side ; basal impressions of thorax deep, 

 single ; wings wanting except in erytkropns. 



KEY TO SPECIES OF GROUP D. 



a. Scutellar stria wanting; thorax subquadrate, hind angles strongly 

 rounded. 142. EKVTHROPUS. 



aa. Scutellar stria lung. 



I). Elytral stria? not punctured; hind angles subrectaugular, slightly 

 prominent. 143. PATRUELIS. 



lib. Basal half of elytral stria? punctured; hind angles obtuse. 



144. FEMORALIS. 



142 (585). PTEROSTICHUS ERYTHROPUS Dej., Spec. Ill, 1827, 



240. 



Elongate-oval. Black, strongly shining; antenna? and 

 legs reddish-brown. Thorax nearly square, sides feebly 

 curved, widely depressed near the hind angles, which are 

 strongly rounded; basal impressions and elytral striae not ) 

 punctured. Length 8-8.5 mm. (Fig. 61.) 



Throughout the State, frequent; usually beneath ' 

 rubbish in sandy localities near water. Probably hi- 

 bernates. March 19-November 5. 



143 (587). PTEROSTICHUS PATRUELIS Dej., Spec. V, 1829, 759. 



Elongate, slender, subcylindrical. Black, feebly shining; antennae and 

 legs dark reddish-brown. Thorax feebly narrowed behind, sides mod- 

 erately rounded, basal impressions sparsely punctured. Elytral striae deep; 

 intervals nearly flat. Length 7.5 mm. 



Throughout the State; more frequent in the northern half. 

 March 26-October 25. 



*144 (588). PTEROSTICHUS FEMORALIS Kirby, Faun. Bor. Amer., IV, 1837, 



31. 



Resembles the preceding, but the form is less slender, the hind angles 

 of thorax more obtuse and the elytral striae finely punctured at least as 

 far as the middle. Length 7.5 mm. 



Throughout the State; common. Hibernates as imago. Feb- 

 ruary 6-December 18. 



XXV. EVARTHRUS Lec. 1852. (Gr., "good + joint") 



Black beetles of medium or large size, possessing the characters 

 of the tribe Pterostichini as above given. Last joint of labial palpi 

 shorter than the next to last, the latter with several long setae in 

 front. Elytra with rounded humeri and one dorsal puncture, lo- 

 cated near the third stria just behind the middle. Hind tarsi not 

 grooved on outer side. Wings wanting; mandibles striate. Pro- 

 sternum not margined behind. 



