Adult Male American Dog Tick
The American dog tick, Dermacentor variabilis, is widely distributed east of the Rocky Mountains and also occurs on the Pacific Coast. The dog is the preferred host of the adult D. variabilis, although it readily feeds on many large mammals including man. The males and females have pale whitish or yellowish markings on the scutum or dorsal shield. Males may be only 1/8 inch long, while engorged females may be as much as ½ inch in length. This tick species is known to transmit Rocky Mountain spotted fever and tularemia.
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