. Bulletin of the Imperial Agricultural Experiment Station in Japan. Agricultural experiment stations. STUDIES ON THE FRUIT-FLIES OF JAPAN. 121 6. Copulation. At copulation, the male embraces the anterior portion of the abdomen of the female, so that its head comes in contact with the hind margin of the female's scutellum. During copulation, the male draws its haustellum in and out. The paired flies often wander about in tliis state. The flies under copulation are often disturbed by other male, or .sometimes female, flies, which swarm around them, their proboscides being used as weapons, and n
. Bulletin of the Imperial Agricultural Experiment Station in Japan. Agricultural experiment stations. STUDIES ON THE FRUIT-FLIES OF JAPAN. 121 6. Copulation. At copulation, the male embraces the anterior portion of the abdomen of the female, so that its head comes in contact with the hind margin of the female's scutellum. During copulation, the male draws its haustellum in and out. The paired flies often wander about in tliis state. The flies under copulation are often disturbed by other male, or .sometimes female, flies, which swarm around them, their proboscides being used as weapons, and not infrequently another copulation is affected by the new successful rival. The duration of copulations observed by me were as follows:. Text-fig. 2. Copulation of Dacits tsitneonis Miyake. Slightly magnified. Table V. Duration of Copulation. Date. Time. Duration. July 27, 1915 * — 14 minutes „ 29, „ t 7P-"i— 10 „ ., 29> .. t 2 — S „ Average 10 minutes „ 30, ., t — 10 „ Aug. I, „ t — 10 ,. ^ * In the open. t In confinement. Copulation occurs at any time in the day, as is the case with the Mediterranean fruit-fly, unlike some foreign fruit-flies, such as the melon-fly {DacHS ciiairbitae Coquillett), of which it is reported that copulation extends only from sunset to dark.^ Rather frequently another male tries to co- pulate with a female already engaged in pairing with a male, keeping its I. Back and Pemberton (3, p. 23). In their former they also state the same 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 Tokyo. Agricultural Experiment Station. Nishigahara, Tokyo
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