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 prosternum is either carinated or terminated in a point, 
either 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, Dalra. (with the antennae greatly compressed and serrated, or semi-pectinated and long), and 
Megaderus, Dej. (with simple antennae, 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 antennae long, simple, or slightly spined, and the thorax 
very large, form four subgenera. 
Dorcace?m, 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. 
Lophonocerus, Latr., has the head much narrower than the thorax, and with the third and three following joints 
of the antenn® furnished with hairs. Cerambyx barbicornis, Oliv., &c. 
Ctenodes, Klug, differs from the preceding in having the antennee 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. 
Phtenicocerus, Latr., differs from all the rest in having the third and following joints of the male antennae pro- 
longed into flattened plates, forming a large fan. P. Dejeanii; Brazil. In the rest the antennae are only simple 
or serrated. 
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 
tibise 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— 
Acanthopteriis, 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 Purpuricenus. Types, Cerambyx Koehleri, 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. 
Tliese compose the subgenus 
Cerambyx proper, some of which have been further separated under the name of HamaticJierus, 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 laiwa 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 Gnom<x of Dejean, having the thorax very long and cylindrical. 
The Cerambycini with the antennae 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, 
terminated by a thicker joint than in the preceding, form the genus CalUdimn, which now constitutes three 
Fig. 81. — Callichroma moschata, 
