Veins R4+5 and M are the longitudinal veins that end near the apex of the wing. Vein R4+5 ends slightly anterior to the wing apex. Vein M ends slightly posterior to the wing apex and its apex is anteriorly curved to varying degrees in most species of Anastrepha. Cell r4+5 lies between these veins. The amount of curvature of vein M is indicated by the ratio of the width of cell r4+5 at its apex divided by its width at crossvein dm-cu. The former is measured from the apex of vein R4+5 to that of vein M (where M reaches the wing margin), and the latter is measured directly anterior to vein dm-cu.
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