96 CARABID.E. OLISTHOPUS. 



Carabus rotundatus, Payk. Mon. 41. Payk. Faun. 1. 136. 

 Harpalus rotundatus, Gyll. Ins. Suec. 2. 158. 

 Agonum rotundatum, Sturm, D. F. 5. 213. 

 Olisthopus rotundatus, Dej. Spec. 3. 177 ; Icon. 2. 388. pi. 123. 

 Steph. Mand. 1. 96,.et Manual, p. 28. Heer, Faun. Helv. 64. 

 Carabus rotundicollis, Marsham, Ent. 471. 

 Odontonyx rotundicollis, Steph. Mand. 1. 96, et Manual, p. 28. 



Brassy brown, very shining. Head convex, smooth, foveated 

 between the antennae, mouth, palpi and antennae pitchy brown, 

 some of the joints of the latter at the base yellow. Thorax 

 broad and short, semi-orbicular, acutely margined, disk convex, 

 transversely wrinkled, the dorsal furrow slight, base with two 

 foveae near the posterior angles, which together with the lateral 

 margins are strongly punctured. Elytra oblong-ovate, rounded 

 at the sides, rather narrowed at the apex, striated, the striae 

 obsoletely punctured, interstices smooth and polished, having 

 three deep impressions between the second and third striae and 

 the usual series on the external margin ; legs pale yellow, with 

 the underside of the body reddish pitchy. Length 3-31 lines. 



The difference between this insect and O. rotundicollis is 

 imaginary. It is a very common species. 



Genus 33. PTEROSTICHUS, Bonelli. 



Mentum dente medio emarginato. Ligula apice truncata ; para- 

 glossis membranaceis, linearibus, ei aqualibus. Palpi articulo 

 ultimo breviore, cylindrico, apice truncato, Mandibulae 

 mediocres, basi interne crenulatte, acuta. Labrum quadra- 

 tum, apice truncatum. Tarsi antici maris articulis tribus 

 dilatatis, singulis obcordatis, subtus biseriatim pectinato- 

 setosis. 



This genus is adopted to comprehend that group of insects to 

 which Dejean assigned the name Feronia*, but which had been 

 separated by Bonelli and others, under the names Ptecilus, Ptero- 

 stichus, Omaseus, Argutor, Steropus, Platysma, Abax, &c., such di- 

 visions having been based chiefly upon certain external characters, 

 which upon examination have not proved so in variable as to warrant 

 their establishment as distinct genera. Redtenbacher divides them 

 into two genera, Pcecilus and Pterostichus, and among the latter 



* The name Feronia cannot here be employed, because it had been 

 proposed twenty years ago by Dr. Leach for a genus of Homalopterous 

 Insects, and published with descriptive characters in the second volume of 

 the Memoirs of the Wernerian Society. J. F. Stephens. 



