_Male and Female._ Golden green. Head brightly gilded, white behind; antennae, tibiae, and tarsi black; thorax with three indistinct cupreous stripes; scutellum blue; pectus with two white tomentose spots on each side; abdomen greenish blue with two transverse white spots on each side; femora blackish-green; wings grey, blackish at the base, praebrachial vein forming a slightly obtuse angle at its flexure, nearly straight from thence to its tip, discal transverse vein curved outward towards its fore end, parted by about half its length from the border, and by much less than its length from the flexure of the praebrachial; alulae blackish. _Female._ Head with a silvery white vertex, frontalia deep black, linear. Length of the body 56 lines; of the wings 10-12 lines. 99. MUSCA MARGINIFERA, n. s. (genus Lucilia, _Desv._) _Foem._ Viridi-cyanea, capite albido frontalibus atris, antennis pedibusque nigris, abdominis segmentis purpureo marginatis, alis cinereis basi subnigricantibus, alulis cinereis. _Female._ Greenish-blue. Head whitish, frontalia deep black, linear, face and third joint of the antennae cinereous; abdomen with a purple band on the hind border of each segment; legs black; wings grey, almost blackish at the base, praebrachial vein forming a hardly obtuse angle at its flexure, between which and its tip it is hardly curved inward, discal transverse vein nearly straight, parted by about half its length from the border, and by more than half its length from the flexure of the praebrachial; alulae cinereous. Length of the body 4-1/2 lines; of the wings 9 lines. 100. MUSCA BENEDICTA, n. s. (genus Pyrellia, _Desv._) _Mas._ Aureo-viridis, capite albo, antennis pedibusque nigris, alis cinereis basi subluridis venis basi fulvis, alulis testaceo-cinereis. _Var._? Abdominis apice purpureo. _Male._ Golden green. Head white in front; antennae and legs black; wings cinereous, slightly lurid towards the base, veins tawny towards the base, praebrachial vein curved at the flexure, almost straight from thence to the tip, discal transverse vein slightly undulating, parted by full half its length from the border, and by little less than its length from the flexure of the praebrachial; alulae cinereous with a testaceous tinge. _Var._? or a distinct species: darker; abdomen purple at the tip. Length of the body 3 lines; of the wings 6 lines. 101. MUSCA OBTRUSA, n. s. (genus Pyrellia, _Desv._) _Mas et Foem._ Purpureo-cyanea, antennis pedibusque nigris, alis cinereis, alulis obscurioribus.