498 REVISION OF THE ELATERID.E 



5. C. tumidicollis, nigerrirnus obesus, tenuissime cinereo-pubescens, thoracc transverso, tumido, 

 antrorsum angustato, lateribus valde rotundatis, angulis posticis non divergentibus, subtilissime punctu- 

 lato, obsolete canaliculato, elytris striis punctatis, postice non exaratis. Long. -25. 



One specimen, collected in Oregon by Dr. J. K. Townsend, and given me by Mr. Wil- 

 cox. Resembles the next, but is a much thicker species, with a more tumid thorax. Co- 

 lour deep black, sprinkled with very fine whitish hairs: front very finely punctulate; mar- 

 gin slightly reflexed : thorax at its greatest breadth nearly one-half wider than long, strongly 

 narrowed in front, and very much rounded on the sides, gradually narrowed for the pos- 

 terior third, with the sides straight near the base: disc convex, very finely, almost imper- 

 ceptibly punctulate, obsoletely channelled : basal striae moderately short, deep: elytra about 

 twice as long as wide, not wider than the widest part of the thorax, oval, slightly pointed 

 behind: striae finely punctured, not deeper posteriorly: interstices flat, scarcely perceptibly 

 punctulate: feet black; claws diaphanous. 



This species is perhaps related to C. 1 a t i u sc u 1 u s Esch. (Thon Ent. Arch. 2, 34,) 

 but the pubescence of the thorax is not fuscous, nor are the knees ferruginous, as is re- 

 quired by the description of that species. 



6. C. c o n ve xulus , niger, nitidus, tenuiter cinereo-pubescens, thorace latitudine breviore, tu- 

 mido, antice valde angustato, postice parum angustato, lateribus rotundatis, angulis posticis non diver- 

 gentibus, subtilissime punctulato, elytris striis punctatis, interstitiis dense punctulatis, subconvexis 

 6 t0 et 8 vo paulo elevatis, tibiis versus apicem, tarsisque rufescentibus. Long. -35. 



Maine and Ohio, sent by Dr. Harris under the name adopted. Similar to the next spe- 

 cies, but larger and more robust, with a much shorter thorax. The thorax is considerably 

 less narrowed at the base than at the apex: the dorsal channel is very faint and short: the 

 basal lines are short and well defined: the antennas are entirely black, and a little longer 

 than the head and thorax: the clypeus is more deeply concave than in C. gagates. 



7. C. g a g a t e s , nigerrirnus, tenuiter cinereo-pubescens, thorace latitudine sublongiore, tumido, 

 lateribus rotundatis, angulis posticis divergentibus, dense subtiliter punctulato, basi breviter canalicu- 

 lato, elytris striis punctatis, interstitiis paulo convexis, dense subtiliter punctulatis. Long. -24 — -28. 



Erich. Germ. Zeitschr. 2, 297. 



Southern States, not rare. A specimen in Dr. Harris' collection is named C. convexus 

 Sat/, but as the antenna? are black, it can by no means be referred to that species. 



8. C. tenebrosus, plumbeo-nigcr, nitidus longiusculus, fusco subtiliter pubescens, thorace lati- 

 tudine sublongiore, convcxo, lateribus rotundatis, dense subtiliter punctulato, obsolete canaliculato, 

 angulis posticis subdivergentibus, elytris dense punctulatis, striis punctatis, interstitiis leviter convexis, 

 genubus femorumque basi rufo-piceis. Long. -28 — -32. 



San Francisco, California. Nearly of the same form as the preceding, but with a less 

 tumid thorax: the basal strise of the thorax are a little longer: the rufous colour of the 

 knees and trochanters is sometimes hardly perceptible. 



9. C. obscurus, plumbeo-nigcr, opacus, dense fusco-pubescens, thorace latitudine non longiore, 

 lateribus valde rotundato, convcxo, confertissime subtilius punctato, postice subcanaliculato, angulis 

 posticis divergentibus, elytris dorso subdeprcssis, striis punctatis, postice minus distinctis, interstitiis 

 planis, dense punctulatis. Long. - 25. 



