Abstract
The population structure, sperm presence, and sugar feeding pattern of Tabanus quinquevittatus were studied during 2 consecutive years in southwestern Quebec. Canopy traps, baited with carbon dioxide or unbaited, were used to collect females. Specimens were dissected for parity, sperm presence, fat body reserve, and stage of terminal follicle development. Diverticulae were tested for the presence of fructose or sucrose by the anthrone test. Parity was similar in both years, nulliparous flies being twice as abundant as parous flies. The prevalence of nulliparous specimens with terminal follicles in stage II suggested that the population studied in southwestern Quebec is anautogenous. Sperm was found in 90% ( n = 1,341) and sugar in 88% of specimens dissected; percentages of sperm and sugar presence were significantly higher in parous than in nulliparous flies. Lower fat body reserve and earlier stages of terminal follicle development were found in parous as compared with nulliparous flies.
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