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Show 3T2 APPBETDIX C- tfNBBCTS. • ANABBUS, Hald. , , This new generic name is derived from the Greek abro%, with the negative prefix an, in allusion to the unprepossessing appearance of the insect. This genus has broad articulate tarsi, the soles concave, and the third articulation cordate. It resembles I* ha-lanffOpsis in general appearance, the form, of the head and labrum, the. high position of theantennae, the narrow sternum, and the position and probably the form of the feet. It has, however, a distinct pelliform pronotum extending over the basal articulation of the abdomen, and concealing rudimentary elytra. Excepting the tarsi, the posterior feet resemble those of a Phalangopris and have the spines distributed in the same manner. The ovipositor is nearly straight, sword- shaped, unlike that of* Phalangop$ isf and it is- two- thirds the length, of the body. A single specimen was brought from the Valley of the Great Salt I^ ke, and of thisth? antennae, palpi, and anterior and medial feet are wanting. AKABBUS SIMPLEX, Hald. PL. X. Fjo. 4. • Dark shining brown, posterior femora with an external and internal row of small spines beneath upon the posterior extremity; tibiae angular, with a row of spines upon each side above, and two approximate rows beneath with the spines alternating. Length fifteen lines, pronotum six, ovipositor twelve, posterior femora and tibiae, eaoh eleven, and tarsi three and a- half. This seems to he one of the species which is eaten by the aborigines of the Valley of the Great Salt Lake. - STHNOPBLMATUS FUSCUS, Hald, ' Shining dark brown, abdomen darker'. One specimen, seven lines long, is from Santa Ftf; another is eight lines long, and'from Chihuahua: the latter has the labrum and tibiie darker than the general colour. 1 It is possible that these small specimens may'be immature, and they would not have been characterized but for the fact that in the allied genera the colour remains remarkably unifottn during*, the various transformations, which renders it probable that they are not the larvse of the rufo- testaceous Mexican S. talpa, which my brother vhas brought from% Jalap*. The tibial springs of &. fuscu* are well developed, a - character by which the adult of |