Of this species, which is easily recognizable by the width of the thorax, I have before me two males (of minor development) and a female. One of the males belongs to the Leyden Museum and originates from Pleyhari: Borneo (J. Semmelink), the other male 1) as well as the female belongs to the Civic Museum of Genoa and has been captured in 1894 at the Mentawei-islands, west of Sumatra, by Dr. Modigliani. Length of the males (with mandibles) 14,5 mm. — The head is transverse, strongly narrowing in straight lines towards the front margin, strongly punctured all over, the punctures bearing a short rufous bristle. The clypeus is broadly emarginate, the emargination terminating in a produced point laterally. A small tubercle at the sides behind the eyes. Mandibles slightly more than half the length of the head, curved, the upper surface punctured and provided on the middle of the inner edge with a trace of a tooth; the inner edge of the lower surface provided near to the base with a pointed tooth which is slightly directed backwards; on the inside, between the upper- and under margin, the mandibles are excavated.