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Show APPENDIX C- OrSKOTS. 867 HYIIEIVOPTERA. • J Among the most interesting entomological discoveries in the imperfectly explored parts of the United States territory, that of the three new species of the genus Labidu* must be included. This is a tropical form, and almost exclusively confined to Brazil, the moist northern species hitherto described being from the West Indian Island of Saint Vincent. The three species were discovered at Fort Gates by Lieutenant Haldeman. " LABIDUS SAJI, Hald. PL. IX. Pio. 1- 8. Luteous, head brown above, and having ( with the mandibles and basal artioulation of the antennae) piliferpus punctures; stemmata large, and the posterior ones twice as far from eaph other as from the eyes; face excavated below the antennae, with the lateral carinas sharp or angular, and the medial line impressed; mandibles large, tapering. slowly, and curved from the, base. Thorax convex and shjning, with numerous piliferous punctures; dorsal line narrow and distinctly impressed from the most prominent part to the anterior margin. Peduncle triangular,' excised posteriorly with well- developed exterior angles. Abdomen indistinctly pubescept, with pilifefous punctures posteriorly. Feet slender, simple, and uniformly coloured; base of the anterior tarsi excavated beneath for the tibial spur; ungues bifid; posterior feet extendiqg beyond the abdomen ; tibial spurs small. Wings with the stigmata' long and narrow, posterior half indistinctly sanguineous, the nervures of the colour of the body, the membrane a pale tint of the pame colour, and translucent. Length eight and a- half, wing seven and a- half, posterior tardus two and a- half lines. LABIDUS HARRISII, Hald. PL. IX. Fio. 4- 6. Polished and pubescent, above black, abdomen rufous. Head black, pubescent; stemmata large, posterior ones three times farther from each other than from the eyes; antennae pale fulvous, base pilose; mouth rufous; mandibles pilose, robust, curved at the base only, the inner edge rectilinear, and the apex acute but not |