•jg MATERIALS TOWARDS A HISTORY 



The facies is that of Elaphidion, whilst it differs from Phymatodes in the antenna?, and 

 in having a larger head. 



58. T. BIMACULATUS. 



Castancous, dorsal line and a tubercle on each side of it polished, a corneous macula at the tip of the elytra. 

 7" long; 1 J wide. Inhabits Pennsylvania. 



Head finely scabrous, frontal line impressed: prothorax subglobular, minutely scabrous: scutel semicircular: 

 elytra with numerous impressed punctures, a large corneous macula at the tip of each, and a small, obsolete 

 one before the middle: femora incrassated, with a broad band of pale corneous yellow: tarsi pale ferruginous, 

 hairy: metastcrnum and abdomen dull testaceous. 



All the parts have a thin clothing of hair. Described from a single individual which 

 was cut from a decayed Fraxinus, in July. 



*SMODICUM, Dej. Cat. 

 Bodv slender, much depressed, polished, and minutely punctured; head and mandibles 

 prominent, eyes projecting; antennae subfiliform, shorter than the body; prothorax flat, 

 longer than wide, sides convex; prosternum with a large, reniform excavation upon each 

 side anteriorly: elytra parallel: femora incrassated. 



59. S. cucuiiforme, Say. (Callidium.) Journ. Acad., v. 277. Mels. Cat., No. S00. 

 S. melanophthalmum, Dej. 



Inhabits Massachusetts, Pennsylvania, (July,) and Carolina, (June, July,) under oak 

 bark, and flies at night. The shallow excavations in the prosternum are scabrous, and 

 without the gloss reflected from every other part. 



*PHYSOCNEMUM. 

 Prothorax subglobose, narrowed posteriorly, tomentose, except the dorsal line, and two 

 slight tubercles behind the middle above: palpi slightly securiform; antennas eleven 

 jointed, longer than the body, and setaceous in the male, as long as the body and 

 almost filiform in the female: elytra flat above, scabrous punctate, with smooth, raised 

 costae, of a pale colour; base nearly square, with the angles projecting, sides compressed 

 towards the middle; tips gaping and separately obtusely rounded: femora clavale. 



Apparently closely allied to the genus Anaglyptus, Mu/sant, p. 91, but differs in having 

 ill the thighs clavate. 



'iO. P. brevilineum, Say. (Callidium.) Journ. Acad., iii. 413. C. antiquum, Dej. 



Pennsylvania and Arkansas. Of the two individuals in Dr. Mclshcimer's cabinet, one 

 has setaceous antennae, and the elytra tapering, as in Agrilus; in the other, they are 

 shorter, and nearly filiform, and the elytra do not taper towards the extremity. Notwith- 

 standing these differences, the facies is so similar that I think the two may be regarded 

 as opposite sexes of the same species. The length of what I suppose to be the male and 

 female, is about five and four lines respectively. 



