Physiological Age of Simulium Tuberosum and Simulium Venustum (Diptera: Simuliidae) in New York State, U.S.A.1

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Abstract
Simulium tuberosum (Lundstroem) and S. venustum Say females were collected by the human-bait capture method at 3 widely separated sites in New York State during 1975. Parity and the stage of follicular development were recorded for 519 females. Nullipars, of both species with stage I or I–II follicles, comprised 62% of the total dissections. No female in this series had follicles beyond stage II development; since ovarian diapause occurred in stage I–II or II in nullipars, populations of both species studied in New York were considered anautogenous. The majority of parous specimens completed 1 gonotrophic cycle and had initiated a 2nd. Of the pars with contracted follicular tubes, only 7 bipars were observed. Uninseminated females of both species were attracted to and initiated feeding on the investigators, but more than 90% of the biting females contained active spermatozoa.

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