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Show 1866.] MR. H. W. BATES ON FORMOSAN COLEOPTERA. 347 mandibles (in well-developed males) is totally different, the apical suberect tooth resembling that of other species found in China, such as N. sinicus and N. championi." To this description I will add that the feebly developed males have scarcely any trace of the erect tooth, and therefore do not much differ from the same form in N. castanopterus ; the side of the head before the eyes remains, however, always much more dilated laterally than in N. castanopterus. The convexity of the elytra culminates at one-third of their length, and then gradually slopes to the apex; in N. castanopterus the elytra are convex to about three-fourths of their length, and then dip rather abruptly to the apex. The female resembles the male in colour and form; but the sides of the head are much more dilated exterior to the eyes, and angulated. iEGUS FORMOSA. .ZEgo lBevicolli simillimus, dififert tantum (6) elytris ad basin an-guste et apud latera late crebre punctatis, interstitio tertio a margine etiam multo latiore. This apparently common Formosan species is so closely similar to AS. larvicollis of China that it can scarcely be considered more than an insular modification of it. In the punctuation of the elytra it is almost identical with AS. capitatus of Malacca and Borneo; but it differs much from that species in the shape of the thorax, position of the mandibular teeth, and in other points, in which it agrees exactly with AS. larvicollis. NlGIDIUS PARRYI. Oblongus, niger, nitidus ; capite quam thorax paulo angustiore, lateribus ante oculos rotundato-dilatato haud angulato, fronte depressa sparsim minus grosse punctata ; mandibulis ( c? ) por-rectis, apice recurvatis, supra rugoso-punctatis absque dente erecto, intus obtuse dentatis; thorace angulis anticis obtusis, margine laterali antice incrassato, medio valde emarginato, angulis posticis late rotundatis, supra larvi, nitido, sulco dorsali abbreviato rugoso, plaga parva utrinque laterali punctata : elytris late punctato-sulcatis. Long. (mand. excl.) 11| lin., mand. 1| lin. 6" • A more elongated insect than the other two continental Asiatic species (N. cornutus and N. obesus), and differing from all the allied species in entirely wanting the erect tooth or horn-shaped dorsal apophysis of the mandibles. The sides of the head are rounded before the eyes, and not produced into a point. The thorax has the lateral margin excavated in the middle. The sulci of the elytra are wide and deep, and have a chain of fovese, but are destitute of the lines of fine punctures seen in N. larvicollis ; the interstices are narrow, polished, and impunctate. NrGlDIUS FORMOSANUS. Oblongo-elongatus, niger; capite ante oculos dilatato, angulis |