. Annals of applied biology. Biology, Economic; Biochemistry. 56 BclladomHi Leaf-Muier of the middle and hind legs of the male are hunched up, the femora ascending backwardly and the tibiae descending forwardly making a sharply acute angle with the femora. The head of the male extends forward above the level of the scutellum. The ventral side of the male's thorax rests upon the dorsal region of the female's abdomen, and the concave ventral surface of the male abdomen arches round the convex dorsal surface of the female's in such a manner that the hypopygium (the modified ninth abdominal segmen
. Annals of applied biology. Biology, Economic; Biochemistry. 56 BclladomHi Leaf-Muier of the middle and hind legs of the male are hunched up, the femora ascending backwardly and the tibiae descending forwardly making a sharply acute angle with the femora. The head of the male extends forward above the level of the scutellum. The ventral side of the male's thorax rests upon the dorsal region of the female's abdomen, and the concave ventral surface of the male abdomen arches round the convex dorsal surface of the female's in such a manner that the hypopygium (the modified ninth abdominal segment) of the male with its claspers and intromittent organ extends under the extremity of the female abdomen and is closely applied to the latter for purposes of coition. The act of pairing continues for about half an hour and even longer, and, if disturbed, the female endeavours to liberate itself by pressing. Fig. 1. Pegomyia hyoscyami in copulation. Tho investing l)ristlos arc oniittod. x 12. with its posterior tarsi against the tarsi of the male, in its attempt to loosen them. Martelli (1908) in his paper " Altre Notizie Dietologiche della Mosca delle Olive," p. 93, describes copulation in Dacus oleae. The position adopted by the male of this species is quite different from that of P. hyoscyami owing to the female's having a long, exserted ovipositor, which is general in the Trypetidae. In this case the anterior tarsi of the male embrace laterally the first abdominal segment of the female, while the others rest upon the ground. Oviposition does not always take place immediately after copulation, and indeed all evidence points to the necessity of an interval of one or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Association of Applied Biologists; Association of Economic Biologists. [Wellesbourn
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