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Show 158 REV. H. s. GORHAM ON N E W COLEOPTERA. [Mar. 16, those preceding them. Thorax about as long as wide if the projecting front angles are taken in, widest a little below the front; basal angles right angles, sides a little sinuate not angular, front margin rounded and a little prominent, basal margin nearly straight; on the disk, which is very even and smooth, are two large inky-black oblong marks a little obliquely placed, a small dot on each side where the thorax is widest, and one in the middle, near the base. Elytra pitchy, inclining to brown, the apex is yellow, and this colour returns some way up the suture and the margins ; they are convex, evenly ovate, and rounded at the apex, narrower at the base, and with a very obsolete sutural stria and scarcely at all widened margin; the epipleural fold is yellow. There is no visible punctuation on their surface ; but it is not glabrous as in Encymon angulatus, but very finely alutaceous, though the sculpture is hardly visible at all. Only two specimens of this insect have come under my notice ; both are males. One is in Mr. Lewis's collection, and the other in Dr. Sharp's, by whom they were obtained from Mr. Cowan. 2. CYMONES COWANI. (Plate XVII. fig. 1.) Nigro-subviolaceus; capite, prothorace, antennis (clava excepta) pedibusque rufis, abdomine rufo-piceo. Long. 6§ millim. <3 Mas. Tibiis anticis dente acuto distantemediano, apicibus intermediis etiam leviter incurvatis. Hab. Madagascar (Cowan). More parallel than C. sharpi, and with the thorax not so convex above, and more quadrate, smaller, and differently coloured. The head and thorax are rusty red, very little shining, and without punctuation ; palpi red ; antennae of moderate length, and with the club, which is black, abrupt, and with its two first joints transversely heart-shaped. The thorax is transversely quadrate, with the front angles a little prominent, the sides a little sinuate, nearly straight, base obsoletely margined, and the sulci distinct but not deep. Elytra dark blackish purple, their apex ferruginous, slightly shining but not bright. Legs in the male example pitchy, in the female clear rusty red. Although this species and the following one differ in several particulars of their structure from C. sharpi, I have not been able to find any characters of sufficient importance to warrant their separation generically. In the abruptly formed club of the antennae and in the form of the thorax these two species are nearer to Encymon, but the strongly toothed tibiae in the male, and the form of the body, less swollen, and with its sides more parallel than in any eastern species of that genus, indicate a radical divergence from that type. Only two specimens have come under my notice; they were obligingly placed in m y hands by Dr. Sharp for description. 3. CYMONES HELOPIOIDES. (Plate XVII. fig. 3, tf .) Niger; parum nitidus; prothorace transversim quadrato, cum elytris subopacis. Long. 6^-7 millim. c3" 2 • |