58 [April, 



of a distorted or mutilated specimen. Chaudoir (Bull. Mosc. 1844, p. 70) has 

 established a genus Rhytiderus, upon Dromius 10-punctatus, from South Ame- 

 rica, but which, as observed by Erichson, (Bericht fiber Kntom. 1844,) be- 

 longs to Kirby's Sericoda. The relation between the genus Sericoda, and a very 

 common insect of northern Europe, does not, however, appear to have been 

 suspected by any of the authors, 



61. P. stigmosus, aeneo-niger, subnitidus, thorace transverso subquadrato, 

 basi rotundata, postice subangustato, angulis posticis obtusis at distinctis, elytris 

 oblongis, tenuiter striatis, utrinque foveis magnis quatuor impressis. Long. '21. 



Flatynus quadripunctatu$\ Lee. Agassiz' Lake Superior, 206. 



Very abundant at Lake Superior, and found also in Maine and New Hamp- 

 shire. Dr. Schaum tells me that he considers this as the same as the European 

 P. quadripunctatus, and in my catalogue of Lake Superior Coleoptera, I gave it 

 as such on his authority. On comparing, however, a large number of specimens 

 with one found in Sweden, the posterior angles of the thorax, although very ob- 

 tuse, appear to be always well defined, while in the European specimen the 

 angles and the base are rounded together, so that the apex of the angle cannot 

 be defined. 



Many of the specimens have two slightly impressed foveae before the middle 

 of the thorax, but some are found without such impressions. 



Olisthopus Dej. 



1. 0. parmatus, niger, nitidus, thorace rotundato, transverso, margine 

 tenui testaceo, basi utrinque minus profunde impressa, elytris thorace latioribus 

 breviter ovalibus, basi emarginatis, subtiliter tripunctatis, sat profunde striatis, 

 piceo-testaceis, disco plus minus infuscato, antennis palpis pedibusque testaceis, 

 ill is extrorsum fuscis. Long. -28. 



Dej. Sp. Gen. 3, 181. 



Feronia parmata Say, Trans. Am. Phil. Soc. 2, 49. 



Olisthopus ductus Say, Trans. Am. Phil Soc 4, 424. 



Pennsylvania, Indiana, Georgia. A type of 0. cinctus, given me by Dr. Mel- 

 sheimer, does not differ in any essential point from the other specimens. I have 

 never seen any in which the lateral bead of the thorax was not testaceous, and 

 am inclined to believe that Mr. Say had not a specimen of his Feroui a parmata 

 before him when he described 0. cinctus. The basal impressions of the thorax 

 are sometimes obsoletely punctulate, in other specimens they are quite smooth ; 

 the elytra are sometimes nearly uniform brownish yellow, sometimes piceous, 

 with the shoulders and sides indistinctly brown. 



2. 0. micans, nigro-piceus, nitidus, cyaneo-micans, thorace rotundato, 

 transverso, marline tenui testaceo postice subreflexo, basi utrinque vix late 

 foveata, elytris ovalibus. basi emarginatis, tripunctatis, tenuiter striatis, mar- 

 gine tenui testaceo, antennis palpis pedibusque flavis, ill is extrorsum fuscis. 

 Long. 18. 



Leeonte, Ann. Lye. New York 4, 230. 



Georgia and Louisiana. Readily distinguished by its small size; the striae of 

 the elytra are finer than in 0. parmatus, and the intervals perfectly fat ; the 

 margin of the thorax is a little reflexed and broader towards the base. 



Species Unknown to me. 

 From California. 



Calathus B e h r e n s i i Mann. Bull. Mosc. 1843, 195. 



Scaphiodactylus micans Chaud. Bull. Mosc. 1844,479. Anchomenus micans 

 Menetries, Bull. Petrop. 2, 58. 



Tanystola striata Motsch. Kafer Russl. (Carab.) 69. Anchomenus striatus 

 Dej. Sp. Gen. 3, 132. Mann. Bull. Mosc. 1843, 198. 



Tanystola s u 1 c a ta Motsch. Kafer Russl. (Carab.) 70. Anchom. sulcatus 

 Dej. Sp. Gen. 3, 131. Mann. Bull. Mosc. 1813. 198. 



