Face Fly Oviposition Studies1

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Abstract
Emerging males nd females of the face fly, Muscautumnalis DeGeer, were caged together for 4 days, after which females were isolated in individual cages. Egg-laying records of 120 selected females were taken each day until natural death occurred, to determine frequency of egg deposition. Eggs were laid in batches of about 20 (maximum 31), with 2–8 days between batches. Average percent of eggs from which pupae developed was 78.2%. One individual lived 58 days and laid 230 eggs in 10 batches, 189 pupae developing from these eggs. Examination of the ovaries of 112 females at known intervals after egg deposition revealed that the eggs were deposited as soon as they became full sized in the ovaries.

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