71. ERISTALIS CONDUCTUS, n. s. _Foem._ Niger, faciei lateribus albis,
antennis, scutello, abdominis fasciis pedibusque testaceis, thorace
antico albido, alis subcinereis apice obscurioribus.

_Female_. Black. Head shining, with white tomentum behind, beneath and
on each side of the face; antennae, scutellum, and legs testaceous,
arista simple; thorax whitish in front, the whitish part continued in a
short band on each side of the pectus; abdomen testaceous at the base
and beneath, and with three testaceous bands; hind tibiae with black
tips; wings slightly greyish, darker towards the tips, cubital vein much
less bent than usual; halteres testaceous. Length of the body 3-1/2
lines; of the wings 6 lines.

72. ERISTALIS SUAVISSIMUS, n. s. _Foem._ Fulvus, capite testaceo vertice
nigro, thorace vittis quinque testaceis, abdomine nigro maculis sex
lutescentibus, segmentorum marginibus posticis aeneis, pedibus nigris
testaceo fasciatis, alis sublimpidis punctis duobus costalibus nigris.

_Female_. Tawny. Head with testaceous tomentum, vertex black, shining;
antennae testaceous, arista simple; thorax with five testaceous stripes;
pectus with two oblique testaceous bands on each side; abdomen black,
with six somewhat luteous spots, the basal pair larger and darker than
the middle pair, which are larger than the hind pair, apical segment
with two testaceous points, hind borders of the segments aeneous above,
testaceous beneath; legs black, tibiae at the base and tarsi testaceous;
wings nearly limpid, costa with two black points; halteres testaceous.
Length of the body 5-1/2 lines; of the wings 10 lines.

73. ERISTALIS MUSCOIDES, n. s. _Mas._ Cyaneo-viridis subchalybeus,
capitis callo antennisque fulvis, faciei lateribus albo tomentosis,
thorace subvittato, abdomine nigro maculis aeneo-viridibus, pedibus
nigris, alis subcinereis, halteribus albis.

_Male._ Bluish-green, with a slight chalybeous tinge. Face with white
tomentum along each side, middle callus tawny, shining; antennae pale
tawny, arista plumose; thorax with three indistinct black stripes, the
lateral pair oblique, callus on each side beneath pale tawny; abdomen
black, second segment with a broad interrupted bluish green band, third
segment with four aeneous-green streaks, fourth segment also with four
streaks which are united on the hind border, ventral segments whitish on
each side; legs black; femora bluish black towards the base; wings
slightly cinereous; h