Head broad and thin, hairy underneath; terminating in a short straight horn, inclining backwards, with a small tubercle on each side. Eyes almost surrounded by the thin sides of the head, being placed so as to see both above and below it. Thorax margined, with several protuberances on its front; and on the top with a strong indented line running from the front to the suture of the elytra, where likewise its margin is interrupted by two smaller impressions, forming an appearance like a square escutcheon. Elytra as long as the thorax, margined, and deeply furrowed, scarcely reaching to the anus. General colour above black or raven grey, but not shining. Thighs very strong, black, and broad. Anterior tibiÆ strong, with three teeth and a spine. Tarsi and ungues very small. Middle and hinder tibiÆ small at the base, but broad and thick with strong spines at the tips. Scutellum obsolete.

Head broad and thin, not hairy underneath. Near the front is a thick tubercle (not rising to an horn, as in Fig. I.) projecting forward, being in some specimens (probably females) very small. Thorax margined, lying very high above the head, having protuberances in front, which in some are very faint, and with a small impression on each side near the margin on the lower part. Elytra longer than the thorax, margined and furrowed, (but not so deeply as in Fig. I.), and reaching to the anus. General colour deep black, and shining like pitch, both on the upper and under sides. Thighs very strong, not hairy. The anterior tibiÆ strong, with four teeth, and a strong spine to each. The tarsi and ungues very small. The other tibiÆ are like those in the preceding figure. Scutellum obsolete.

There is no doubt that all these figures belong to one species; though differing, not only in size, but structure. AntennÆ light red brown. Head thin, rounded, margined, and of a green golden colour; some (which are evidently males) being furnished with a smooth, round, black horn, almost as long as the thorax, and inclining backwards; others have only a small tubercle in the place of the horn; and others have a small horn, about one-fourth the length of the first mentioned, as in Fig. IV. Thorax next the head golden green; behind and on the upper part is golden red, and margined, rough and shagreened. In the horned specimens this part terminates on each side the posterior margin in a projecting angle, which is more or less conspicuous, in proportion as the horn is long or short. Those which are quite hornless, as Fig. V., are entirely destitute of these angulated risings, having the thorax rounded, but in its front a small black protuberance or swelling is seen. Elytra golden green, inclining to a blue, and very much channelled, with small striÆ placed between others of larger size, extending almost even with the anus. Abdomen black, the sides shining green. Anterior femora and tibiÆ black and hairy; the latter very strong and dentated, having a long moveable spine fixed on the inner edge of each, extending somewhat beyond the tarsi, which are very short and small. Intermediate and posterior thighs shining golden green, broad and strong. TibiÆ black, with two spines (one very long) at the tips. Tarsi five-jointed, ungues single, and not divided as most insects have them. Scutellum obsolete.

Entirely black. Head broad and black, extending on each side beyond the eyes, having a small horn on it projecting forwards. Thorax margined, high and prominent, with some small protuberances on its front. Scutellum obsolete. Elytra furrowed, longer than the thorax, and margined; extending beyond the anus. Femora strong and round. TibiÆ small at the base, thickened towards the tips, and armed with spines.

Entirely black, shining like pitch on the under side. Head broad, flattish, and smooth. Thorax margined, smooth, and convex. Scutellum obsolete. Elytra margined, smooth, not reaching to the anus, and rather longer than the thorax. Anterior tibiÆ having three teeth on their outer sides, above which are several very minute ones. Intermediate and posterior thighs and tibiÆ smaller than are usually observed among those lamellicorn beetles which have no scutellum.

Entirely black. Head margined and rough, having two small protuberances entirely surrounding the eyes. Palpi rather long. Thorax convex, smooth, and margined, being as long as the elytra, and having on each side near the lateral margin a small impression. On the posterior margin next the suture are two more impressions, and a longer one between them. Scutellum obsolete. Elytra furrowed, and extending to the anus, having a double margin on the sides. Anterior tibiÆ as long as the thorax, and remarkable for not having any tarsi, but being bent inwards at their extremities and dentated on their outer sides. Middle femora very broad and flat. TibiÆ short, very narrow, and small at their base, but broad at the tips. Hinder thighs and tibiÆ not so broad as the middle ones. Tarsi five-jointed.