

546 



INSECTA. 



nearly equals half of that of the elytra, sometimes smooth, semiorbicular, with a single tooth at the posterior 

 angles, sometimes very unequal and tubercular ; the presternum is either carinated or terminated in a point, 

 cither flat, truncated, entire, or notched at its posterior extremity, which is applied to a produced lobe of the meso- 

 sternum ; the fore-legs at least are wide apart at the base. The scutellum is large in some, the tarsi short and 

 dilated. 

 Lissonotus, Datm. (with the antennae greatly compressed and serrated, or semi-pectinated and long), and 

 Megaderus, Dej. (with simple antenna;, shorter than the body), form a first division, having the thorax nearly 

 semi-orbicular and very large, with a single tooth on each side at the hind angles, and the scutellum very 

 large. 



Those with the thorax very rough and multidentate, the antenna? long, simple, or slightly spined, and the thorax 

 very large, form four subgenera. 



Dorcacerus, Dej., having the head vertical, large, and nearly as broad as the thorax, and the scutellum small. 

 Type, Cerambyx barbatus, Oliv. 



Trachyderes, Dalm., with the thorax large and much broader than the head ; the posterior extremity of the 

 prosternum, and also the opposite part of the mesosternum, elevated and keeled. 



Lophonocents, Latr., has the head much narrower than the thorax, and with the third and three following joints 

 of the antenna; furnished with hairs. Cerambyx barbicornis, Oliv., &c. 



Ctenodes, Klug, differs from the preceding in having the antenna; much shorter than the body, and pectinated or 

 serrated ; the thorax toothed at the sides. (Ctenodes zonata, &c.) 



In the following the thorax, either square or cylindrical, orbicular, or nearly globular, is much shorter than the 

 elytra; the prosternum is neither carinated nor pointed at its posterior extremity, and the scutellum is always 

 small. 



Phtcnicocerus, Latr., differs from all the rest in having the third and following joints of the male antenna; pro- 

 longed into flattened plates, forming a large fan. P. Dejeanii / Brazil. In the rest the antennae are only simple 

 or seriated. 



Callichroma, Latr., comprises many species, remarkable for their colours, and the agreeable odour they emit, 

 and these exhibit a curious anomaly in the maxillary palpi being very much smaller than the labial, and even than 

 the maxillary lobe, which is advanced; the posterior 



tibiae are often compressed. [The only British species,] 

 Cerambyx moschatus, Linn, [or the Musk Beetle as it has 

 been erroneously named, the scent it emits being more 

 like otto of roses than musk], is about an inch long, en- 

 tirely green, or shaded with blue, some specimens being 

 of a more golden colour. [This handsome species is very 

 common upon willows, and may be easily detected by its 

 scent.] There are numerous other species found on the 

 Continent and in America. 



Other Longicornes of the same division, but with 

 ordinary-shaped maxillary palpi, are distinguished from 

 the following by possessing twelve distinct joints in the 

 antennae, at least in the males ; we unite them into the 

 single subgenus — 



Acanthopterus, Latr. — Some American species, with 

 the thorax nearly square or subcylindrical, and the elytra 

 ordinarily terminated by one or two spines, are called 

 Stenocorus, by Dalman ; others, peculiar to the western parts of the Old World, with the thorax nearly globular, 

 and the antennae simple and not fasciculated, form the subgenus Purpurieenus. Types, Cerambyx Kcehleri, Des- 

 fontainii, &c. Another species, 



Cerambyx alpinus, Linn., has the body depressed, and the third and three following joints of the antennae ter- 

 minated by a little bundle of hairs. 



The following Cerambycini have only eleven joints to the antennae ; some, or at least the males, have the antennae 

 long and setaceous ; the last joint of the palpi in the form of a reversed cone ; the thorax is either nearly square 

 and a little dilated in the middle, or oblong and nearly cylindrical ; it is often rugose, and tubercled at the sides. 

 These compose the subgenus 



Cerambyx proper, some of which have been further separated under the name of Hamaticherus, having the 

 thorax very rough, and spined or tubercled at the sides in the middle, with the third, fourth, and fifth joints of the 

 antennae evidently thicker than the following, thickened, and rounded at the tip. C. heros, Fab., is an abundant 

 continental species, the larva of which forms deep burrows in oak wood, and which is probably the Cossus of the 

 ancients. 



We unite in the same subgenus different species of Callichroma of Dejean, having the thorax entire or scarcely 

 unequal, and either oval or subcylindrical. These are exotic, and nearly all from America, being of small size. 



We further unite in the same genus the Gnorrue of Dejean, having the thorax very long and cylindrical. 



The Cerambycini with the antenna; generally scarcely longer than the body, the thorax always unarmed, and 

 sometimes nearly globular or orbicular, and sometimes narrower and subcylindrical, the palpi always very short 

 tern.i ated by » thicker joint than in the preceding, form the genus Callidium, which now constitutes three :— 



liruma muschata 



