122 (119). Fronto-orbital bristles present.

123 (128). X, 52 before middle of wing (both X, 4 and X, 52 near the base and exceedingly near together) or no X-vein on V, 5.

124 (127). X, 52 immediately under X, 4 (or nearer the base), or X, 51 and X, 52 both absent (plate V, 38).

125 (126). Arista bare or nearly so.

Part of Phytomyzidæ, LIV

126 (125). Arista with long hairs on one side.

Astiadæ, LV

127 (124). X, 52 present and placed further from base than X, 4.

Part of Agromyzidæ, LIII

128 (123). X, 52 at or beyond the middle; X, 4 and X, 52 neither very near to the wing base nor to one another.