_Male?_ Black. Head whitish about the mouth. Antennæ piceous. Thorax purplish cupreous, with a dingy whitish stripe along each side; pectus livid. Abdomen with two lanceolate apical appendages; hind borders of the segments whitish. Wings brownish cinereous, with slight whitish streaks on the exterior areolets. Length of the body 7 lines; of the wings 16 lines. 21. SARGUS REDHIBENS, n. s. _Foem._ Cyaneus, antennis fulvis, thoracis lateribus anticis purpurascentibus, abdomine purpureo, pedibus albidis, tibiis posticis femoribusque nigricante strigatis, alis cinereis, _Var. β._ Vertice purpureo, thorace viridi. _Female._ Blue. Antennæ tawny. Thorax purplish on each side in front. Abdomen purple, much broader than the thorax. Legs whitish; femora with a blackish streak above towards the tips; hind tibiæ with a blackish apical streak. Wings cinereous; veins black; stigma blackish. Halteres tawny. _Var. β._ Vertex purple. Thorax green. Length of the body 3-1/2-4 lines; of the wings 7-9 lines. This may be a local variety of _S. metallinus_, but differs from that species by the dark marks on its hind legs, and by the wing-veins being black at the base. 22. SARGUS MACTANS, n. s. _Foem._ Cupreo-viridis, abdomine cupreo, pedibus testaceis, tibiis posticis basi nigris alis cinereis apices versus obscurioribus. _Female._ Cupreous green, with cinereous down. Head wanting. Abdomen cupreous. Legs testaceous; hind tibiæ black for half the length from the base. Wings cinereous, darker from the discal areolet to the tips; veins black; stigma brown; halteres testaceous. Length of the body 4-1/2 lines; of the wings 10 lines. 23. SARGUS INACTUS, n. s. _Mas._ Albido-testaceus, vertice nigro, thoracis disco scutellique apice purpureis, pectore maculis duabus cupreis, alis cinereis. _Male._ Whitish testaceous. Vertex black. Disk of the thorax and scutellum towards the tip purple; pectus with a cupreous spot on each side. Wings cinereous; veins black; stigma dark brown; discal areolet shorter than that of the two preceding species. Length of the body 5? lines; of the wings 10 lines. Gen. NERNA, _Walk._ 24. NERNA IMPENDENS, n. s. _Mas et Foem._ Nigra, cinereo-subtomentosa, antennis tarsis posterioribus halteribusque testaceis, tarsi anticis tibiisque piceis, alis cinereis apud costam exteriorem nigricantibus. _Male and Female._ Black, with very slight cinereous pubescence. Antennæ, posterior tarsi, and halteres testaceous; tibiæ and fore tarsi piceous. Wings cinereous, blackish along the exterior part of the costa; veins and stigma black. Length of the body 3-1/2 lines; of the wings 6 lines. Gen. SOLVA, n. g. _Corpus_ lineare. _Proboscis_ lanceolata. _Palpi_ porrecti, lineares, caput non superantes, _Antennæ_ lanceolatæ. _Scutellum_ inerme, _Abdomen_ thorace longius. _Pedes_ breviusculi, femoribus posticis incrassatis subserratis. _Alæ_ sat angustæ.