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Further observations on the behavior of adult males of Dermacentor variabilis (A cari: Ixodidae) with respect to attached females.

The mating behavior of adult Dermacentor variabilis ticks infesting guinea pigs in the laboratory was observed. Within 24 h postinfestation, 68.7% of the males were attached within 4–6 mm of attached females. Males were observed venter to venter with females as early as 72 h postinfestation. However, these males continued feeding rather than transferring sperm, indicating that spermatogenesis was not yet complete. Males that assumed the venter to venter position with females after 3 days of feeding did not reattach but initiated the mating process. In the latter ½ of the feeding period males lost the ability to discriminate between the sexes. Multiple matings by males were observed and 15% of the females were not mated.