Abstract
Laboratory-reared females of Haematobia irritans (L.), (Diptera: Muscidae) were dissected, and the following characteristics were used to classify physiological age or development: presence of sperm in spermathecae, presence of follicular relics, pattern of tracheoles on ovarioles, contents of malpighian tubes, appearance of fat bodies, and numbers of nonfunctional ovarioles. By using combinations of these characteristics, female flies were placed in the following 5 categories: newly emerged, young nulliparous, parous, old parous, and old nulliparous.
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