Very nearly allied to _M. refixa_ and to _M. perfixa_, but differing slightly in the veins of the wings. _Male and Female._ Blue, more or less mingled with purple. Head black, slightly cinereous in front; antennae and legs black; wings grey, veins black, praebrachial vein forming an almost angular curve at its flexure, nearly straight from thence to its tip, discal transverse vein very slightly undulating, parted by little more than half its length from the border, and by about its length from the flexure of the praebrachial; alulae dark cinereous. Length of the body 2-1/2--3 lines; of the wings 5-6 lines. 102. Musca domestica, _Linn._ See Vol. I. p. 128. 103. MUSCA OBSCURATA, n. s. _Foem._ Nigra, subcinerascens, capite postico albo, thorace vittis quatuor angustis nigris, abdomine tessellato, alis obscure cinereis apud costam nigricantibus, alulis testaceo-cinereis. _Female._ Black, slightly covered with cinereous tomentum. Head white behind; thorax with four slender black stripes; abdomen distinctly tessellated with four rows of cinereous reflecting spots; wings very dark grey, blackish towards the costa, praebrachial vein forming a somewhat rounded and very slightly obtuse angle at its flexure, hardly curved inward from thence to its tip, discal transverse vein slightly undulating, parted by less than half its length from the body, and by more than half its length from the flexure of the praebrachial; alulae cinereous, with a testaceous tinge. Length of the body 3-1/2 lines; of the wings 7 lines. 104. MUSCA PATIENS, n. s. _Foem._ Nigra, cinereo-tomentosa, frontalibus antennisque piceis, thorace vittis quatuor tenuissimis nigris, abdomine tessellato, alis cinereis. _Female._ Black, with cinereous tomentum. Head whitish behind, frontalia piceous, linear; antennae piceous; thorax with four very slender black stripes; abdomen tessellated; wings grey, veins black, praebrachial vein forming an obtuse and somewhat rounded angle at its flexure, from whence it is hardly curved inward to its tip, discal transverse vein undulating, parted by less than half its length from the border, and by more than half its length from the flexure of the praebrachial; alulae slightly cinereous, with testaceous borders. Length of the body 3 lines; of the wings 6 lines. 105. MUSCA ERISTALOIDES, n. s. (genus Pollenia? _Desv._) _Mas et Foem._ Aureo tomentosa, crassa, subtus testacea, capite antico albo frontalibus antice rufis, antennis piceis basi rufis, thorace vittis tribus abbreviatis fulvis, scutello cyaneo, abdomine cyaneo basi fasciisque duabus albis, pedibus fulvis, tibiis tarsisque nigris, alis cinereis apud costam fuscescentibus. _Var. mas._ Minor, thorace vittis tribus nigris.