Xiphidium gracillimum, sp. nov.—Very slender. Brown above, face and sides greenish, wing veins purple; a conspicuous dark brown middorsal stripe on the head and pronotum, bordered by broad pale bands, sometimes with dusky or purplish markings on the cheeks, sides of pronotum and middle of face. Antennæ brown, extremely long and slender. Eyes very prominent, in side view circular in outline. Fastigium of the vertex ascending, strongly advanced (about the length of the eye seen from above), very narrow (about one-fourth the distance between the eyes), its sides parallel or slightly convergent. Lateral lobes of the pronotum usually triangular in outline by the exceptional reduction of the anterior ventral angle and the straightening of the posterior margin, which forms a line with the hind margin of the posterior process, the humeral sinus distinct but shallow.