The oviscape is the elongate, tubular or conical, basal part of the ovipositor. It is formed from the fused tergite and sternite of segment 7. It bears a pair of spiracles laterally, and a pair of flangelike lobes basolaterally. Its length is measured ventrally along the midline. The spiracle ratio is the distance from the base to the level of the spiracles divided by the length of the oviscape.

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