21. Sargus redhibens, n. s. Fœm. 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 31/2-4 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. Fœm. 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 41/2 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 Fœm. 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 31/2 lines; of the wings 6 lines.