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The tergal pigmentation patterns of Culicoides variipennis and Culicoides furens (Diptera: Ceratopogonidae).

Changes in area of the tergal pigmentation patterns in abdominal segments 2–7 of female Culicoides variipennis were examined in relation to age after emergence, oogenesis following the 1st blood meal, oviposition, and oogenesis following the 2nd blood meal. Pigmented areas were determined in each of the 14 age groups by weighing cut-outs from enlarged photomicrographs of 10 females. By far the greatest increases in pigmentation were found to be associated with 2 periods (1) the first 24 h after emergence and, (2) the 36 h immediately following the 1st blood meal. No further changes occurred after oviposition or after the 2nd blood meal. The tergal pigmentation patterns of Culicoides furens were similarly examined and analysed. Data were taken from 10 females in each of 11 age groups. There were no significant changes in the pigmented areas in any segment except segment 2. A significant change occurred in this segment only after the blood meal was taken and consisted of a relatively small increase in the width of the lateral and median pigment lobes. In C. furens , segment 2 is the only one in which pigment is distributed in 3 lobes.