_Male._ Closely allied to _A. Tantalus_. Dark ferruginous. Head above, antennae, pectus, abdomen, and legs black; thorax bordered with red hairs; pectus with a silvery dot on each side; abdomen with red hairs on each side at the base, with two silvery bands, with two silvery apical spots, and with a ventral, nearly triangular, silvery patch; wings cinereous, black at the base and along five-sixths of the length of the costa, veins and halteres black. Length of the body 8 lines; of the wings 18 lines. 50. Anthrax semiscita, _Walk._ See Vol. I. p. 118. 51. Anthrax degenera, _Walk._ See Vol. I. p. 15. Gen. GERON, _Meigen._ 52. GERON SIMPLEX, n. s. _Mas._ Ater, antennis pedibusque nigris, alis subcinereis, halteribus fulvis. _Male._ Deep black. Eyes bright red; proboscis a little longer than the thorax; antennae and legs black; wings slightly greyish, veins black; halteres tawny. Length of the body 2-1/2 lines; of the wings 5 lines. Fam. EMPIDOAE, _Leach._ Gen. HYBOS, _Fabr._ 53. HYBOS BICOLOR, n. s. _Mas._ Fulvus, ore antennisque testaceis, abdomine, femoribus posticis apice tibiisque anticis piceis, tarsis anterioribus ferrugineis, alis obscure cinereis. _Male._ Tawny. Mouth and antennae testaceous; abdomen, hind femora at the tips, and fore tibiae piceous, anterior tarsi ferruginous; wings dark grey, veins black. Length of the body 3-1/2 lines; of the wings 7 lines. Fam. DOLICHOPIDAE, _Leach._ Gen. Psilopus, _Meigen._ 54. Psilopus aeneus, _Fabr. Syst. Antl._ 268. 9. Inhabits also Java. 55. PSILOPUS BENEDICTUS, n. s. _Mas et Foem._ Aureo-viridis, facie pectoreque argenteis, antennis testaceis apice nigris, thorace vittis tribus cupreis, abdomine fasciis cupreo-purpureis, maculis lateralibus albidis, pedibus testaceis tibiis posticis tarsisque nigris, alis subcinereis, costam versus et apud venas transversas nigro-fuscis, halteribus testaceis. _Foem._ Vertice cyaneo-purpureo, abdomine fasciis cyaneis. _Male and Female._ Golden green. Face silvery; antennae testaceous, black towards the tips, arista full as long as the thorax; thorax with three cupreous stripes; pectus silvery; abdomen with cupreous purple bands and with whitish spots along each side; legs testaceous, tarsi and hind tibiae black; wings slightly greyish, blackish brown along the costa and about the transverse veins, veins black, fore branch of the praebrachial vein curved inward, discal transverse vein undulating; halteres testaceous. _Female._ Vertex bluish purple; abdomen with blue bands. Length of the body 4--4-1/2 lines; of the wings 7-8 lines. 56. PSILOPUS LUCIGENA, n. s. _Mas._ Aureo-viridis, facie pectoreque argenteis, antennis tarsisque nigris, thorace vittis tribus rufo-cupreis, abdomine fasciis cupreo-purpureis, femoribus lutescentibus, tibiis piceis, femoribus anticis apice nigricantibus, alis nigris apice albis, halteribus fulvis apice nigris.