_Female._ Cupreous green. Face silvery; antennae, legs, and halteres testaceous; pectus, abdomen beneath, and triangular spots on each side whitish; abdomen purple, hind borders of the segments black; posterior tarsi blackish; wings grey, veins black, praebrachial vein forming a right angle at its flexure, between which and the border it is much curved inward, discal transverse vein very slightly curved outwards. Length of the body 3 lines; of the wings 5 lines. This species resembles the _Psilopi_ in the structure of the praebrachial vein. Gen. DIAPHORUS, _Meigen._ 62. DIAPHORUS RESUMENS, n. s. _Mas et Foem._ Obscure viridis (mas) aut niger (foem.), facie pectoreque albidis, antennis piceis, abdomine nigro-cupreo basi obscure testaceo, pedibus anterioribus tibiisque posticis basi obscure testaceis, pedibus posticis nigris, alis nigricantibus apud marginem posticum pallidioribus, halteribus testaceis. _Male and Female._ Dark green (male) or black (female). Face and pectus whitish; antennae piceous; abdomen cupreous-black, dull testaceous towards the base; hind legs black, hind tibiae towards the base and anterior legs dull testaceous; wings blackish, paler along the hind border, veins black, praebrachial vein and discal transverse vein straight; halteres testaceous. Length of the body 2 lines; of the wings 3-1/2 lines. Fam. SYRPHIDAE, _Leach._ Gen. CERIA, _Fabr._ 63. CERIA SMARAGDINA, n. s. _Foem._ Saturate metallico-viridis, subtilissime punctata, faciei lateribus cupreis, antennis nigris, arista nivea, thorace bivittato, abdomine aeneo-viridi, tarsis nigris, alis dimidio costali nigro, halteribus testaceis. _Female._ Deep metallic green, very finely punctured. Head blue in front, sides of the face cupreous-purple; mouth, antennae, and tarsi black; arista snow-white; thorax with two almost contiguous darker stripes; abdomen aeneous green, with the exception of the petiole, which is very thick; wings slightly greyish, costal half black; halteres testaceous. Length of the body 7 lines; of the wings 14 lines. 64. CERIA RELICTA, n. s. _Mas._ Nigra, faciei lateribus, thoracis maculis quatuor humeralibus, pectoris fasciis duabus lateralibus, scutello, abdominis maculis duabus basalibus fasciisque duabus flavis, tibiis flavescentibus apice piceis, alis apud costam nigris, halteribus testaceis. _Male._ Black. Head yellow beneath, and in front with the exception of a black stripe on the disk of the face; arista white; thorax with two yellow spots on each side in front; scutellum yellow; pectus with an oblique yellow band on each side; abdomen not petiolated, with a tumid yellow spot on each side at the base, hind borders of the third and fourth segments yellow; femora at the tips and tibiae yellow, the latter piceous towards the tips, tarsi piceous; wings greyish-black towards the costa, excepting a lurid costal streak which extends along half the length from the base; halteres testaceous. Length of the body 6 lines; of the wings 11 lines.