SYNOPSIS OF THE PRINCIPAL GENERA OF THE MUSCIDÆ OF THE WORLD
a. Proboscis long, directed forward, adapted for piercing, or oral margin much produced, snout-like.
b. Oral margin produced snout-like; vibrissa placed high above the oral margin; antennal arista either pectinate or more or less plumose.
c. Antennal arista short or long-plumose; neither sex with distinct orbital bristles.
d. No facial carina between the antennæ. Rhynchomyiinæ
e. Arista short-plumose. R. speciosa. Europe. Rhynchomyia R. D.
ee. Arista long-plumose. I. phasina. Europe and Egypt. Idiopsis. B. B.
dd. With flattened carina, the bases of the antennæ separated; no abdominal macrochætæ. Cosmininæ
C. fuscipennis. South Africa. Cosmina