NATURAL SCIENCES OF PHILADELPHIA. 73 



One specimen, Tejon : another from Sacramento Valley given me by Mr. 

 S. S. Rathron. Resembles in appearance E. a p i c a t u a , but the color of the 

 elytra is much more vivid, the intervals between the striae are flat, the thorax 

 is much more densely punctured and without lustre. The hair on the head 

 and thorax is entirely black, on the elytra it is yellowish. 



49. Melanactes dens us. 



50. Cardiophorus fulvipes, plumbeo-niger, nitidus pube brevissima 

 incanus, thorace latitudine baud longiore, convexo, lateribus valde rotuudatis, 

 dense subtilissime punctulato, obsolete canaliculate, angulis posticis baud 

 divaricatis, elytris subtilissime punctulatis, striis punctatis, interstitiis con- 

 vexis, pedibus fulvo-testaceis. Long. '36. 



One specimen, Tejon. Related to C. tenebrosus, but with the feet red, 

 and the thorax more rounded on the sides. Belongs to the division with tarsi 

 and ungues simple. 



Aflastus. 



Frons paulo concava, antice sensim defiexa, medio baud marginata : oculi 

 convexi ; lab rum breve antice rotundatum, clypeo arete affix um ; mandibulse 

 modice elongatae, acuta?, medio obtuse dentatae : palpi articulo ultimo non 

 longiore subcylindrico : antennas (maris) elongatae, 11-articulatae, articulo 

 lmo crassiore, sequentibus duobus breviore, 3io 2ndo sesqui longiore, haud 

 dilatato, 4to triangulari, 3io sesqui longiore ; 5 10, 4to sequalibus, 11 lon- 

 giore apice acuminate Prosternum antice late rotundatum, sutura laterali 

 recta, postice mucronatum : coxa? anticae parvae, mediae contiguae, posticae 

 laminis intus subsubito latioribus truncatis : tarsi longiusculi, pubescentes, 

 articulis 1 4 sensim brevioribus, 5to praecedente longiore, ungtiiculis integris : 

 tibiae tenues, calcaribus parvis ; abdomen 5 -articulatum. 



Has the appearance of an elongate Corymbites, (e. g. C. appressifrons) but 

 is closely allied to Plastocerus and Euthysanius, from which it differs essen- 

 tially only by the antennae being elongate and serrate. 



51. Aplastus speratus, nigro-fuscus, pube cinerea vestitus, thorace lati- 

 tudine fere sesqui longiore, antrorsum sensim angustato, lateribus rectis, 

 angalis posticis elongatis valde divaricatis, punctate, postice obsolete canali- 

 culate, elytris striis distinctis, interstitiis punctatis subconvexis. Long. "66. 



Several specimens from Tejon. The antennae extend considerably beyond 

 the base of the thorax, and being of the same length, or nearly so, in all the 

 specimens, I infer that they are all males. 



This genus most perfectly completes the line of genera from the aberrant 

 Elaters like Campylus, through Plastocerus and Euthysanius to Cebrio. This 

 resembles the Elaters, and Exithysanius the Cebrios. An interesting fact, 

 though not without parallel in other families and classes of animals, is that 

 these transition forms should all occur in one Zoological region. 



52. Plastocerus fr at e r . Under this name I would characterize a species 

 very closely related in form and sculpture to P. Schaumii, but differing by 

 the thorax being broader and considerably rounded on the sides. The female 

 is of the same form as the male, but with the elytra slightly narrowed towards 

 the tip ; the wings are perfect. The antennae of the female are short and 

 serrate. The specimens are in the collection of Mr. Henry Ulke, and I have 

 not access to them at this present moment, but will on a future occasion 

 make a full description of them. I will add, in passing, that the sexual 

 characters given by me (Trans. Am. Phil. Soc. 10, 502,) are erroneously 

 founded. 



53. Euthysanius 1 a u t u s . Several males and one female were procured 

 at Tejon. The latter is one of the most remarkable forms yet found and indi- 

 cates the close relation between this genus and the Cebrionidae. The head and 



1859.] 



