81$ PROCEEDINGS OP THE ACADEMY OF 



medio valde excavato, et utrinque ante medium fovea magna impresso, elytris 

 striis punctatis, interstitiis paulo convexis, dense rugose punctatis, antennis 

 articulo 3io 2ndo duplo majore. Long. <^.78, $1-42. 



Mas antennarum articulis 4 11 ramo subbasali interno, duobusque externis, 

 uno basali, altero pone medium ornatis. 



Femina antennis serratis. 



California. The male from Mr. Murray, the female from Mr. Rathvon. 



48. Limonius discoideus rufo-testaceus, opacus, pallide pubescens, 

 capite fortiter punctato, oceipite nigro, fronte plana antice recte truncata, 

 thorace fortiter dense punctato, latitudine longiore antrorsum angustato, 

 lateribus late rotundatis angulis posticis brevibus carinatis, convexo, macula 

 ovali dorsali nigra, elytris striis punctatis, interstitiis haud convexis, profunde 

 punctatis, antennis piceis, articulo 3io 2ndo plus sesqui longiore, postpectore 

 piceo ; prosterno suturis antice excavatis. Long. *40. * 



Rocky Mountains, at the head of Missouri River ; for this beautiful species, 

 I am indebted to Mr. H. Feldmann. 



49. Dolopius ferrugineipennis, elongatus, niger, cinereo-pubescens, 

 capite thoraceque dense punctatis, hoc latitudine longiore, a medio an- 

 trorsum angustato, lateribus late rotundatis, angulis posticis elongatis di- 

 vergentibus fortiter carinatis, elytris rufo-testaceis, striis punctatis, intersti- 

 tiis subconvexis dense punctatis, antennis (?) pedibusque flavo-testaceis. 

 Long. '42. 



Oregon. A specimen with only the basal joint of the antennas remaining. 

 Easily distinguished from our other species by the form of the thorax. 



50. Asaphes tumescens, nigro-piceus, fusco-pubescens, capite thorace- 

 que fortius sat dense punctatis, hoc (feminse) convexo, latitudine paulo longi- 

 ore postice canaliculato, lateribus rotundatis magis ad apicem, versus basim 

 paulo angustato, angulis posticis acutis parallelis fortiter carinatis, elytris 

 striis punctatis, interstitiis paulo convexis punctulatis, antennarum articulo 

 3io 2ndo duplo longiore et 4to paulo angustiore. Long. -49 -53. 



Santa Cruz Island, California. Mr. Bache. Closely allied to the dark varie- 

 ties of A. decoloratus, but the head and thorax are much more strongly 

 punctured. The second joint of the antennse is shorter, being only half as 

 long as the third, and the strise of the elytra are more strongly punctured. 



51. Asaphes oregonus, niger, pube longiore fulva suberecta vestitus, 

 capite fortiter thorace sat dense subtilius punctato, hoc angulis posticis cari- 

 natis paulo divergentibus, elytris fiavo-testaceis, striis subtilius punctatis, in- 

 terstitiis planis rugosis et punctulatis ; antennarum articulo 3io 2ndo sesqui 

 longiore, pedibus fusco-piceis, tibiis partim, tarsisque fuscis. Long. -32 *40. 



Mas thorace latitudine longiore, antrorsum sensim angustato, lateribus late 

 rotundatis. 



Femina thorace latitudine fere breviore, convexiore apice magis angustato, 

 lateribus magis rotundatis. 



Oregon. 



Sericosomus fla vipennis. A specimen from Mr. Murray agrees with 

 the description of Dolerosomus fla vipennis Motsch. (Bull. Mosc. I860,) 

 except that the apical margin of the thorax is not testaceous. The color is 

 variable in our common S. s i 1 a c e u s, so that I am not inclined to consider my 

 specimen as a distinct species from that described by Mr. Motschulsky. It is 

 closely allied to S. s i 1 a c e u s , but differs by the antennae being nearly black, 

 and by the thorax being less deeply punctured, with the hind angles less di- 

 verging, (but is perhaps merely a variety of S. d e b i 1 i s Zee, Proc. Acad. Nat. 

 Sc, 1859, 72 ;) the latter is of a pale testaceous color, with only the head ob- 

 scure. These variations in color are all seen in S. s i 1 a c e u s. 



52. Corymbites colossus, niger, capite thoraceque snbnitidis, fortiter 



[Nov. 



