MR. WA.LKER ON DIPTERA COLLECTED AT MAKESSAR. 97 



Female. Black, pubescent. Head wanting. Thorax purplish black, 

 with a dingy whitish stripe along each side ; disk of the pectus dingy 

 whitish. Anterior tibiae dingy whitish above. Wings blackish; veins 

 black ; halteres dingy whitish, with blackish knobs. Length of the 

 body 9 hues; of the wings 20 lines. 



Malel Black. Head whitish about the mouth. Antennae 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. Fcem. Cyaneus, antennis fulvis, tho- 

 racis lateribus anticis purpurascentibus, abdoraine purpureo, pedibus 

 albidis, tibiis posticis feraoribusque nigricante strigatis, alis cinereis. 

 Var. /3. Vertice purpureo, thorace viridi. 



Female, Blue. Antennae 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 

 tibiae with a blackish apical streak. Wings cinereous ; veins black ; 

 stigma blackish. Halteres tawny. Var. ^. Vertex purple. Thorax 

 green. Length of the body 3|-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. Fcem. Cupreo-viridis, abdomine cupreo, 

 pedibus testaceis, tibiis posticis basi nigris, alis cinereis apices versus 

 obscurioribus. 



Female. Cupreous green, with cinereous down. Head wanting. Ab- 

 domen cupreous. Legs testaceous; hind tibiae 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^ 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 scu- 

 tellum 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. 



XT 



Gen. Ner^a, Walk. 



24. Nerna impendens, n. s. Mas et Foem. Nigra, cinereo-subto- 

 mentosa, antennis tarsis posterioribus halteribusque testaceis, tarssi 



LINN. PROC. — ZOOLOGY. 7 



