Close to and much resembling P. lugubris Rits. from Nias (N. L. M. vol. XIV, 1892, p. 215), but smaller (measuring 26 mm. in length) and more vividly colored. Above opaque, the smaller basal half of the elytra, however, shining. — Head dark blue with green tinges, red in the middle beneath. 1st, 2nd and basal half of 3rd antennal joint dark blue, apical half of 3rd joint and the 4th—7th joints yellow, the 7th spotted with black at the apex above, the subsequent joints black. — Prothorax red, front- and basal margins dark blue, the latter surrounding the coxae and invading the intercoxal part. Without any trace of spine or tubercle laterally; the disk flat, strongly punctured, sharply separated from the sides as if it were a piece led in; the sides and undersurface finely, evenly and very densely punctured, forming a lustreless surface. Scutellum dark blue, with black pubescence. — Elytra metallic green, the smaller basal half bald, shining, rather densely punctured, the larger apical half opaque, very finely and densely punctured and covered with a short and very dense black pubescence; at one third of its length this black portion is crossed by a very narrow transverse band of a pale yellowish pubescence, touching neither the suture nor the lateral margins, and a similar though still more delicate pubescence is present on the shining green basal half just before the black pubescence. — Meso- and metasternum and the abdomen steelblue, the latter more greenish towards the apex and covered by a silky white pile, especially on the hindborders. The legs steel-blue, the femora strongly punctured, the tibiae more finely. The 5th ventral segment broadly and deeply emarginate, the 6th broadly but less deeply. Hab. Borneo: Mahakkam river. — The described malespecimen has been presented to the Leyden Museum by Prof. A. W. Nieuwenhuis, to whom I dedicate the species.