COLEOPTERA. 107 



of this subdivision might be designated by the title of regular Ce- 

 rambyci, in contradistinction to those of the following one, which, in 

 many respects, are anomalous, and the last of which seem to be con- 

 nected with those of the tribe that follows it. They compose the 

 genera Ceramhyx, Clytas, Callidium of Fabricius, and some of his 

 Stenocori, a different genus from that similarly and previously so 

 named by Geoffrey. They form tlie genus Cerambyx of Linnaeus, 

 to which we must also add some of his Lepturse. 



Modern entomologists have augmented the number of these gene- 

 ric sections, but their characters are so little distinct, and so much 

 blended, that these genera may all be united in one, or in 



Cerambyx, 

 A number of species, all from South America, proportionally shorter 

 and wider than the following ones, with the antennae frequently pecti- 

 nated, serrated, or spinous, are remarkable for the extent of their 

 thorax, the length of which is almost equal to that of the elytra ; 

 sometimes glabrous, it is almost semi-orbicular, and nearly uniden- 

 tated at the posterior angles ; at others it is very vmeven and tuber- 

 culovis. Their prsesternum is either carinated or terminated in a 

 point, or plane, truncated, entire or cmarginated at its posterior ex- 

 tremity, which is laid on an anterior projection of the mesosternura. 

 Their anterior legs, at least, are remote at base. The scutellum is 

 large in several; the tarsi are short and dilated. 



Those of this division, in which the thorax, almost semi-orbicular 

 and always very large, is smooth or simply granulous, with a single 

 tooth on each side, at the posterior angles, in which the posterior ex- 

 tremity of the prsesternum is plane and truncated, either unemar- 

 ginated, or marginated and laid on the mesosternum ; where the 

 scutellum is always very large, and the legs are very remote, form 

 two subgenera. 



LissoNOTUs, Dalm. — Cerambyx, Fah, 



AVhere the antennae are long, strongly compressed, and serrated 

 or pectinated, and where the posterior extremity of the praesternum 

 offers no emargination*, 



Megaderus, Dej. — Callidium, Fah. 



Where the antennae are simple, and shorter than the body, and the 

 posterior extremity of the prsesternum is emarginated, and receives, 

 in that emargination tlie opposite end of the mesosternum, so that 

 they are intimately united or seem to form but one plane f . 



Those in which the thorax is very uneven, tuberculous, or pluri- 

 dented, with the prsesternum carinated or terminated posteriorly in a 

 point, have been arranged in four subgenera. 



* See Schoenh., Synon. Insect.; Dalman, Anal. Entom. ; and Germar, Insect. 

 Spec. Nov. 



t Callidium stigma, Fab. ; Dej,, Catal., p. lOG. 



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