58 DESCRIPTIONS OF NEW SPECIES. 



sist of a sinuated vitta extending from the humerus to the tip 

 near the suture ; the external margin is also dark. 



209. C. gllttatum. .Nigrum, fortiter punctatum, thorace latitudine 

 baud breviore, postice modice angustato, lateribus obsolete serrulatis, 

 callo dorsali pone medium laevi, elytris gutta rotundata pone medium 

 margineque apicali rufo-testaceis ; antennis pedibusque rufis. Long. -10. 



Southern States. 



210. C. notatmn. Nigrum fortiter punctatum, thorace latitudine 

 baud breviore, postice paulo augustato, lateribus serrulatis, callo postico 

 dorsali ; elytris gutta minuta ad medium margineque angusto apicali ru- 

 fo-testaceis ; antennis pedibusque rufo-testaceis. Long. '10. 



One specimen, Pennsylvania. Differs from the preceding by 

 the spot being smaller and not posterior to the middle of the 

 elytra. The dorsal segments of the abdomen in all the species 

 are finely punctulate. 



PROTEItfUS LATR. 



5811. P. parvullis. Niger nitidulus subtiliter pubescens. elytris pi- 

 ceis confertim punctulatis, margine apicali pallidiore, anteunarum arti- 

 culis duobus primis pedibusque testaceis. Long. -05. 



Lake Superior. Similar in size and form to P. basalis, but 

 the base of the elytra is not reddish. 



MEGARTHRUS STEPH. 



212. IH. excisus. Longiusculus, piceus, confertim punctatus, thorace 

 canaliculato latitudine plus duplo breviore, antrorsum angustato, late- 

 ribus late rotundatis subrepandis, ad basin rotundatim emarginatis, angu- 

 lis posticis minutis rectis, antennarum articulo primo pedibusque piceo- 

 testaceis. Long. '10. 



Lake Superior, one specimen. Narrower than M. americanus, 

 with a differently shaped thorax. 



ISOMALUS ER. 



213. I. pallidlis. Testaceo-rufus nitidus, capite thorace elytrisqne 

 parce subtiliter punctulatis, thorace obovato, subtilissime canaliculato, 

 utrinque oblique vage impresso, in margine apicali utrinque bifoveato, 

 abdomine antice infnscato, segmentis singulis utrinque 2 vel 3 punctatis. 

 Long. -14. 



Pennsylvania, Lancaster Co., in ants' nests; very rare. 



