92 WALKEE ON DIPTEEA OF AETJ ISLANDS. 



black ; wings black, tips snow-white, fore branch of the praebrachial 

 vein slightly curved inward, discal transverse vein much curved out- 

 ward ; halteres tawny, with black tips. Length of the body 4i lines ; 

 of the wings 9 lines. 



57. Psilopus flavicornis, Wied. Auss. Zweifl. 11. 227. 31. 

 Inhabits also Sumatra. 



58. Psilopus terminifer, n. s. Mas. Aureo-viridis, vertice cya- 

 neo-purpureo, facie pectoreque argenteis, antennis, pedibus halte- 

 ribusque testaceis, abdomine apicem versus atro fasciis duabus cupreis, 

 alis subcinereis apice nigris. 



Male. Golden-green, slender. Vertex bluish-purple ; face and pectus 

 silvery ; antennse testaceous, arista about half the length of the body ; 

 fourth and fifth segments of the abdomen deep black with a cupreous 

 band on the hind border of each segment, tip blue ; legs and hal- 

 teres testaceous; wings greyish, paler along the hind border, tips 

 black, fore branch of the praebrachial vein slightly curved inward, 

 discal transverse vein slightly undulating. Length of the body 3 lines ; 

 of the wings 5 lines. 



59. Psilopus orcifer, n. s. Fcem. Purpureus, facie pectoreque sub- 

 cinereis, antennis, pedibus halteribusque nigris, abdomine cyaneo- 

 viridi segmentorum marginibus posticis purpureis, alis nigricantibus 

 margine postico cinereo. Var. Viridis, vertice cyaneo, abdominis 

 segmentis basi nigris. 



Female. Purple, rather stout. Face and pectus slightly cinereous ; 

 antennae, legs, and halteres black ; abdomen bluish-green, hind bor- 

 ders of the segments purple ; wings blackish, cinereous along the 

 hind border, fore branch of the praebrachial vein forming an obtuse 

 angle, discal transverse vein very undulating. Var. Green. Vertex 

 blue; abdominal segments black at the base. Length of the body 

 2^ lines ; of the wings 5 lines. 



60. Psilopus egens, n. s. Mas et Fmm. Purpureus, facie pectore- 

 que cyaneo-viridi cinereo subtomentosis, antennis, pedibus halteri- 

 busque nigris, metathorace viridi, abdomine cyaneo, suturis nigris, alis 

 cinereis. 



Male and Female. Purple, Face and pectus shghtly covered with cine- 

 reous tomentum, the latter bluish-green ; antennae black, arista 

 much more than half the length of the body ; metathorax green ; 

 abdomen blue, sutures black ; legs and halteres black ; wings grey, 

 fore branch of the praebrachial vein much curved inward, discal 

 transverse vein straight; length of the body 2|— 2f lines; of the 

 wings 5 lines. 



Gen. DoLiCHOPUS, Latr. 



6L DoLiCHOPUS TRIGONIFER, n. s. F(Em. Cupreo -viridis, facie ar- 

 gentea, antennis, pedibus halteribusque testaceis, pectore, ventre ab- 



