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Show 646 REV. H. S. G O R H A M O N T H E [Dec. 20, the eighth joints very slender and longer than wide, the three club-joints lax and subequal, the apical being the largest. The thorax is particularly short and broad, and with the front and head more declivous than usual in this genus. Its margin is flattened and broad, but with the edges raised, so that its own surface is concave as in S. internexus. The sides narrow strongly from the base without being much rounded ; the basal sulci are quite distinct, reaching nearly half across the disk. The elytra are very convex and rather pointed behind, finely punctured, but wholly without serial punctuation, rufous, with a black patch, not coming nearer the base than one third of the elytral length, and not reaching the margins nor apex. The underside is black, with the abdomen very faintly rufous, and the legs are black. A considerable number of this species were met with in the island of Kiushiu and it was also found by Mr. Lewis on the Main Island at Kashiwagi. 4. STENOTARSUS NIGRICLAVIS, Gorh. Ent. Mo. Mag. ix. p. 206. Hab. K I U S H I U : Nagasaki. Mr. Lewis met with three or four more specimens of this species at the beginning of June 1881. With S. musculus it will form a separate section of the genus, differing from other unstriate Stenotarsi in the feeble structure of the antennae. ECTOMYCHUS, n. gen. Corpus oblongum, subparallelum, supra pubescens, subtus vix ves-titum. Antenna breves, tenues, clava triarticulata, articulis duobus primis intus paulo productis. Oculi haud granulati. Pronotum lateribus marginatis et deplanatis, sulcis basalibus leviter impressis. Elgtra prothoracis latitudine, oblonga, ad apicem conjunctim rotundata. Prosternum breve, processu coxas anticas vix superante, apice truncato, subruguloso. Pedes breves, femora compressa; tarsi breviusculi, articulo secundo bilobato. I propose this genus for the reception of a small Beetle having very much the appearance of a Mycetophagus, but from the structure of its tarsi and from the margination of the sides of its thorax and the basal impressions evidently allied to Stenotarsus. 1. ECTOMYCHUS BASALIS, n. sp. Oblongus, niger, parce pubescens, obsolete subtiliter punctatus, elytris basi rufis, antennis tarsisque rufo-piceis, illis clava Long. 3 millim. Hab. M A I N ISLAND : Kawatchi, Miyanoshita, Kurigahara. Y E Z O : Sapporo. Head small, received into the prothorax ; eyes small and very little prominent; antennae short, but longer than the head and thorax, basal joint very stout, second short, but equally stout, third to eighth thin and short, the third about twice as long as the others, ninth and tenth acuminate internally, very much larger, and apical joint ovate, forming a lax but distinct club. Thorax nearly twice as wide |