Genus Tropidia Meig. (1822).

It is doubtful to what genus the following species belongs; it was originally placed in Milesia by White^† and later on retained therein by Walker; but since the cell R₁ of the wing is open it certainly does not belong to Milesia. Although there may be many excellent grounds for the establishment of a new genus upon this species, it is considered advisable, in the meantime at least, to retain it in the genus Tropidia, with which it coincides to a certain extent. The genus is characterized by the following: Eyes bare, holoptic at a point in the male, moderately dichoptic in the female; antennae short, 3rd joint rather rectangular; vein R_{4 + 5} gently curved into cell R₅; cross-vein r—m beyond middle of cell 1st M₂ and oblique. Face without central knob, practically vertical to oral