Abstract
Laboratory culture of Aedes vexans (Meigen), a floodwater mosquito which fails to mate in cages, is possible only by induced copulation. To induce copulation, females must be immobilized by anesthesia. The influence of anesthetics on rates of insemination was investigated by anesthetizing virgin females with nitrogen, carbon dioxide, and chloroform prior to inducing copulation. Single decapitated males were mated with virgin females for 3 repetitive copulations and rates of insemination were determined by examination of spermathecae. The efficiency of insemination varied according to the anesthetic used for immobilization and by the sequence of mating virgin females with single males. Rates of insemination were consistently high for females anesthetized with nitrogen (87%); intermediate for females anesthetized with carbon dioxide (70%); and low for females anesthetized with chloroform (57%).
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