CARABID^E. PTEROSTICHUS. 107 



Carabus nigrita, Fab. Ent. S. 1. 158. Fab. S. El. 1. 200. 

 Harpalus nigrita, Gyll. Ins. Suec. 2. 88. 

 Feronia nigrita, Dej. Spec. 3. 284 ; Icon. 3. 68. pi. 134. 

 Omaseus nigrita, Steph. Hand. 1. 114, et Manual, p. 32. 

 O. rufo-femoratus, Steph. Mand. 1. 115, et Manual, p. 33. 

 Pterostichus nigrita, Erichson, Kafer, 71. 



Winged, shining black. Head smooth, with an oblong wrinkled 

 fovea on each side. Thorax subquadrate, sides rather rounded, 

 narrowed behind, posterior angles obtuse, each with a deep bi- 

 lobed punctured fovea. Elytra oblong, deeply striated, the strise 

 occasionally very faintly punctured, having also three deeper 

 impressions between the second and third strise; abdomen of 

 the $ with a small tubercle on the last segment. Length 4|-5 

 lines. 



O. rufofemoratus, Steph., is a variety of this very common 

 species. 



15. P. anthracinus : oblongus, niger ; thorace subquadrato, basi 



utrinque punctulato foveolato bistriatoque, angulis posticis 

 acutiusculis ; elytris oblongis, subparallelis, striatis, inter- 

 stitiis planis, summo apice ad suturam denticulo pro- 

 minulo armatis. 

 Mas, abdominis segmento ultimo profunde foveolato. 



Carabus anthracinus, 111. Kafer, 1. 181. 



Harpalus anthracinus, Gyll. Ins. Suec. 4. 425. 



Feronia anthracina, Dej. Spec. 3. 286 ; Icon. 3. 69. pi. 134. 



Omaseus anthracinus, Steph. Manual, p. 33. 



More oblong than nigrita. Thorax longer, the sides straighter 

 and the base more truncate, the posterior angles more acute, the 

 basal fovese larger and more densely punctured. Elytra more 

 elongate, less narrowed in front, sides more parallel, armed at 

 the extreme tip next the suture with a minute denticulation, a 

 character which distinguishes it in both sexes from nigrita ; and 

 the c? has furthermore a large fovea on the last segment of the 

 abdomen beneath. Length 5 lines. 



Not uncommon in marshes ; abundant at Whittlesea Mere 

 and at Herringstone, Dorset; also within the London district, 

 at Hammersmith, Battersea fields, &c. It is found likewise in 

 the north of England and in Ireland. 



16. P. gracilis : oblongus, niger ; thorace subquadrato, postice 



utrinque punctato foveolato ; elytris oblongis, striatis, striis 

 obsolete punctatis ; antennis pedibusque piceis. Abdominis 

 segmento ultimo in utroque sexu Isevigato. 



