446 Mr. H. W. Bates on the Longicorn Coleoptera many of the heads of M. stolonifer were composed of a mass of minute polymorphic cells {Amoeba), which, after having been placed in water on a slide, soon separated from their globular aggregation, and crept away from each other under moto-plastic forms, which forms, under other circumstances, I assume, would have respectively been surrounded by firm, sporidious capsules, and, on the latter bursting in development, would have come forth as propagative amoebous germs or embryos, like those which come from the sporidia of the Myxogastres, with which family Corda has already placed the Mucoridese, though not probably from the circumstance just mentioned, but from their general resemblance (Corda, Icones Fungorum, p. 19 j and Mucor stolonifer sen B-hizopus nigricans, p. 20, tab, xii. fig, 83)*. XLVIII. — Contributions to an Insect Fauna of the Amazon Valley, Coleoptera : Longicornes. By H. W. Bates, Esq. [Continued from p. 405.] Group Anisocerina. Genus Trigonopeplus, Thoms. Thomson, Class, des Ceramb. p. 339. This genus is an aberrant form in the group Anisocerinse, differ-ing from most of the other genera in having the terminal joint of the antennae, compared with the penultimate, of normal length, and the elytra obtusely truncated at the tip, instead of rounded. It resembles the genus Chalastinus so much in general form that I have thought it better to place it in this group. The third and three following joints of the antennse are slender and slightly thickened at the tips ; this indicates an affinity with the Anisocerinse, where the thickening of the tips of the antennal joints is a very general character. The typical species of Trigonopeplus [T. signatipennis, Thoms., a native of South-east Brazil) has a deep semioval notch in the middle of the epistome — a singular peculiarity of * Familiar examples of these fungi are given, that the reader may the more easily procure them for examination. Abundance of the Myxogas-tres may be found on the dead wood in the building-timber and fire-wood yards during the monsoon, among which is the JEtkalium or creeping-fungus," which, under the microscope, by transmitted light, affords one of the most wonderful objects in the world. To obtain this, look among the chips and sawdust of the astringent woods diu'ing the "rains," and having found a yellow-or a brown-coloured slime, take a piece of it, about half the size of a pea, and place it in a watch-glass with a little water; afterwards put the glass in a shaded or dark place for a few hours, when the ^thalium will, if young and fresh, have passed into an arborescent form fit for observation.
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