Mr. C. 0. Waterhouse on new Coleoptera. 379 the present also we have no sound data for deciding whether, how, and when the Ascones and Leucones were developed from the Pharetrones. It is, however, certain that the family Sycones branched off very early (at least in the Jurassic period). [To be continued.] XLI. — Descriptions of new Coleoptera belonging to the Genera Monomma, Silis, and Lithinus. By CHARLES O. Waterhouse. Monommidae. Monomma quadrimaculatum, sp. n. Elliptico-ovale, convexum, piceum, nitidum ; elytris nigro-piceia, maculis rotundatis rufis notatis. Long. 2|-lin. General form of M. philippinarum. Head very closely, finely, but distinctly punctured. Thorax densely and rather strongly punctured ; the sides not reflexed, but narrowly im-pressed within the margin. Elytra rather strongly and closely 6triate-punctate ; the punctures in the scutellar region much larger, the first stria very short ; the interstices rather closely, very delicately, but distinctly punctured ; each elytron with two rather large round spots, one near the shoulder, the other subapical. Hah. Philippine Islands [Cuming). Monomma pilosum, sp. n. Elliptico-ovale, leviter convexum, nitidum, nigro-fuscuro, fulvo-pilosum ; thorace subtiliter irrcgulariter punctulato, angulis anticis productis obtusis, marginibus piceis ; elytris sat fortiter 6triato-punctatis, striis apiceru versus evanescentibus ; prosterni projectura valle marginata, medio fortiter parce punctate ; tarsis longis. Long. 6i lin. Rather an elongate species, not very convex, blackish brown, with very short fulvous pubescence above. Thorax not quite twice as broad as long, very finely and not very thickly punctured, the lateral margins flattened but not re-flexed. Elytra scarcely broader than the thorax, three times as long, rather attenuated towards the apex ; the lines of punctures are well marked, but disappear towards the apex ;
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