It much resembles Pasimachus and Emydopterus, but is distinguished from them; firstly, by the maxillary palpi, of which the last joint is broad, flat, angular on the inner side, and rounded at the end, this joint being a little longer than the one before it; secondly, by the labrum, which is wide, short, and indented on the exterior side; and thirdly, by the labial palpi, which have their last joint in the same form as the maxillary, but longer and hatchet-shaped. The mandibles are very strong, moderately arched, striated transversely, and with a strong tooth on the inner side; the jaws are also striated and obtuse at the ends. The head is similar to that of Pasimachus, the thorax is heart-shaped, the elytra oval, with angles towards the joints not strongly marked, convex, and a little serrated behind; the claws are powerful, with a strong tooth on the outer side of the middle of the tibiæ of the centre pair. [Illustration] This insect is one of the most magnificent Carabidæ known, and is nearly two inches in length. The collection in the British Museum contains a fine specimen of it. DESCRIPTIONS OF TWO NEW SPECIES OF LAND-SHELLS DISCOVERED BY M. MOUHOT IN THE INTERIOR OF CAMBODIA. _Helix cambojiensis._ LAND-SHELLS. Shell sinistral, deeply umbilicated, conoidly globose, rather inflated; upper portion of the whorls of a rich-toned transparent chestnut colour, edged at the satural margin with purple black; lower portion of the whorls white, turning to a delicate straw-colour by the overlying of a shining, transparent, horny epidermis, encircled below the periphery and around the umbilicus with two very decided, broad, rich purple black bands; whorls six, corrugately puckered throughout at the satural margin, the first four whorls very densely granosely wrinkle-striated in the direction of the lines of growth, the striæ gradually disappearing on the fifth whorl; aperture lunar-orbicular; lips simple, reflected partly round the umbilicus. [Illustration]