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Show 412 MR. F. SMITH ON NEW SPECIES OF ICHNEUMONS. [May 1, gate marginal cell and three submarginal ones, the first submarginal elongate, broad at the base, and narrow towards the apex ; the second submarginal minute, subtriangular, and with a short petiole ; the third submarginal elongate, narrow, and extending to the apex of the wing ; the anterior tarsi twice the length of the tibiae; the posterior tarsi only a little longer than the tibiae ; the claws of the tarsi bifid ; the pulvillus small. Abdomen curved, narrowed at the base, and slightly compressed ; the two basal segments of equal length, the three following of equal length and a little shorter than the basal one ; the two apical segments shorter than the fifth ; the ovipositor nearly seven times the length of the insect. DOLICHOMITUS LONGICAUDA. (Plate XLIV. figs. 2 and 2 a.) Black and shining, with the base of the abdomen yellow; wings smoky. The face finely punctured, slightly convex; a minute yellow spot, in some examples, at the lateral angles of the face, close to the base of the mandibles; the anterior margin of the clypeus broadly but slightly emarginate. Thorax-the metathorax nearly flat and oblique; wings fuscous, with a purple iridescence, the anterior margin of fore wings dark brown ; the anterior tibiae more or less ferruginous within, occasionally black. The two basal segments of the abdomen above, and all beneath, bright yellow; the sheaths of the ovipositor black, the latter ferruginous. Length 9-11 lines; of the ovipositor 3|-6| inches. Hab. Bogota, Columbia. Genus PERISSOCERUS, Smith. Head subgiobose; antennse 22-jointed, joints 3rd to 7th densely pubescent, at the apex of the seventh joint the antennse are elbowed, as is also the terminal joint. Thorax oblong; the metathorax oblong- quadrate, divided into six compartments above by two longitudinal and one transverse carina ; wings with one elongate marginal cell and two submarginal ones; the posterior legs rather stout, elongate, the femora somewhat swollen ; the claws of the tarsi simple and very small; the first joint of the tarsi longer than the rest united. Abdomen with a short petiole, depressed beyond the first segment, the second and third tuberculate at the base; the ovipositor nearly as long as the bead and thorax. PERISSOCERUS PLUMICORNIS. (Plate XLIV. figs. 3 and 3 a.) Head and thorax black and shining ; the abdomen bright ferruginous. The head subgiobose; the antennae black to the apex of the seventh joint and densely clothed with short black pubescence; the eighth joint to the fourteenth white, with the apical joints black. The mesothorax with two deep sutures, each emanating from the middle of the margin of the scutellum, and diverging forwards to the sides, and dividing the disk into three parts, which are convex, and covered with curved strise; wings hyaline, stigma and nervures black ; the coxse, trochanters, and femora ferruginous; the tibiae |