NATURAL SCIENCES OF PHILADELPHIA. 347 



43. Elater rnoerens, ater, paruiii nitidus, subtiliter cinereo-pubescens, 

 thorace latitudiue haud breviore, convexo, confertira fortiter punctato, postice 

 vix canaliculato, elytris antice parallelis, profande punctato-striatis, intersti- 

 tiis couvexiusculis rugose punctatis, antennis articulo 3io 2ndo sesqui lougiore, 

 tarsisque fuscis. Long. "46. 



East of Fort Colville, and at Sinyak water depot. Mr. Gibbs. Precisely 

 resembles E. luctuosus Lee, except that the pubescence is finer and cine- 

 reous, instead of brownish gray, and that the third joint of the antennae is a 

 little longer, and the thorax a little more rounded on the sides. 



44. Elater d i m i d i a t u s , niger nitidus, pube brevi griseo-fulva baud 

 dense vestitus, thorace latitudiue vix breviore, lateribus m.igis rotundatis, 

 fortiter haud dense punctato, postice canaliculato, elytris antice parallelis, 

 profunde punctato-striatis, interstitiis paulo convexis, rugose punctatis; a basi 

 usque ad medium rufo-^estaceis, tarsis fuscis, antennis articulo 3io 2ndo sesqui 

 longiore. Long. -36. 



One specimen, Oregon. Related toE. apicatus, but the thorax is more 

 rounded on the sides, and less closely punctured. The orange color of the 

 elytra reaches only to the middle, and extends farther along the sides than 

 the suture. 



45. Cardiophorus longior, elongatus, niger nitidus, subtiliter cinereo- 

 pubescens, thorace latitudine conspicue longiore, convexo, lateribus late ro- 

 tundatis, antice posticeque sequaliter parum angustato, confertim subtiliter 

 punctulato, elytris thorace vix latioribus fortiter punctato-striatis, interstitiis 

 paulo convexis subtilissime punctulatis, antennarum articulo 2ndo. genubus, 

 tibiarum apice tarsisque fusco-testaceis. Long. *31. 



Bitter Root Valley, at the head of the Missouri. Mr. John Pearsall. The spe- 

 cimens furnished me, like all those collected by Mr. Pearsall, who was attached 

 to Lieut. Mullan's expedition, which have passed through my hands, are 

 in excessively bad condition, and I am therefore not able to fix the characters 

 of this species with precision. It is related to C. t umidico 11 i s and gag- 

 ate s Lee, but differs by the much longer thorax, which is equally narrowed 

 before and behind. From the Californian C. tenebrosus Lee. it differs by 

 the same character, as also by the color being pure black. The hind angles 

 are but slightly prolonged, the basal lines are moderately long, and the thorax 

 is channeled at the base. 



As several specimens of other insects, in the collection of Mr. Pearsall, had 

 lost their color from some material in which they were preserved, it is possi- 

 ble that the antenna may be found to be entirely black in those which are 

 well kept. 



46. Melanotus variolatus, nigro-piceus, elongatus, griseo-pubescens, 

 fronte subplana punctis grossis umbilicatis confertis impressa, thorace latitu- 

 dine parum longiore, lateribus parallelis antice rotundatis, confertim grosse 

 punctato, punctis umbilicatis, postice subcanaliculato, angulis posticis carinatis 

 haud divergentibus, elytris fortiter punctato-substriatis, interstitiis parum 

 convexis parce punctatis, pedibus rufis ; antennarum articulo 3io 2ndo sesqui 

 majore subtriangulari. Long. "45 # 55. 



San Pedro, California, Mr. C. M. Bache. Related to M. oregonensis 

 and longulus, but differs from the first by its rufous feet, and more densely 

 punctured thorax, and from both by the sides of the thorax being mor^ 

 rounded, with the hind angles not diverging. 



The thorax of the female is broader, more convex and more rounded on the 

 sides than that of the male. 



47. Pityobius M u r r ay i , niger subnitidus, subtiliter vix conspicue pubes- 

 cens, thorace fortiter punctato, latitudine longiore lateribus late rotundatis, 

 angulis posticis productis divergentibus, carinatis, profunde canaliculato, 



1861.] 



