The Book of the Fly / A nature study of the house-fly and its kin, the fly plague and a cure

by George Hurlstone Hardy

115 (108). X, 5¹ present, or, if absent, then X, 5² also absent (i.e., either two X-veins or no X-veins on V, 5) (plate V, 33, 38).

116 (117). Scutellum of the male extraordinarily long and squared off behind; costa thickened from the end of V, 1 to the wing tip.

Part of Phycodromidæ (genus Thyreophora)

117 (116). B, I (6) usually short, and somewhat triangular; costa normal.

118 (133). Mouth bristles present.

119 (122). Fronto-orbital bristles absent.

120 (121). Wings without a black spot near the tip.

Piophilidæ, XLVII

121 (120). Wings with a black spot near the tip.

Part of Sepsidæ, XLVI