Yellowish metallic green, legs darker. The head is somewhat square, the transverse suture being rather indistinct; the margin of the clypeus is distinctly reflexed. Antennae dark brown, ten-jointed; 1st joint longest, thickened at the end, with ferruginous hairs behind; 2nd rounded, thin; 3rd, 4th, and 5th, with the separating lines very indistinct, those before the 3 lamellated joints short, transverse. Maxillary palpi with the terminal joint dilated, rather blunt at the tip, depressed above, and hollowed out at its base. Legs rather thick, the outer of the two tarsal claws of the third pair of legs, cleft at the end, anterior tibiae externally sub-tridentate. Thorax with the sides somewhat angulated and narrowly margined, rounded behind, but the sides of the posterior margin are straight, the surface is minutely punctured and covered with brown hairs, the sternum of the mesothorax is without a spine, or projecting angle; elytra in some specimens of a rich, lively, metallic, yellowish green, in other coppery green with the suture and margin dark green, the surface chagreened and punctured. Underside of the body and legs dark green, the former covered with ash-grey pubescence, or rather longish soft hairs. This insect seems to be one of those links which connect such genera as Anoplognathus, Amblyterus and Brachysternus, and it is very difficult to say to which of these genera it is most allied. Professor Burmeister has begun to eradicate the Phyllophagous genera of Beetles, and from his deep knowledge of Entomology, and the particular acquaintance which he has with the principles of general Zoology, as well as the thorough manner in which he means to go through all the species, much light may soon be expected to be thrown on the subject; how true is Darwin's remark, made in speaking of a somewhat anomalous bird, "this, from its varied relations, although at present offering only difficulties to the systematic Naturalist, ultimately may assist in revealing the grand scheme, common to the present and past ages, on which organized beings have been created." (Journal and Remarks Voyage of Beagle 3 page 112.) BIPHYLLOCERA, g.n. Antennae (seemingly) nine-jointed, the first joint long, much thickened at the end, and furnished with several stiff hairs, the five last are lamelliform, the lamellae in the male long, and pinnated on one side; labium deeply grooved in the middle, notched at the tip; palpi with the terminal joints longest, sub-cylindrical; head moderate; clypeus separated by a distinct line, basal part slightly hollowed out, as is the head between the eyes; thorax short; elytra elongate, somewhat rounded on the lateral edge, truncated at the end; legs slender; tibiae of first pair anteriorly sub-tridentate, tibiae of second and third pairs with many spines, claws of posterior tarsi entire, joints of tarsi, slender, elongate.