The unfed female black-legged ticks have a reddish body and a dark brown dorsal scutum located behind the mouthparts. Females are approximately 3.5 mm in length, much longer than the body of male ticks which range from 2.0 to 2.7 mm in length. Male black-legged ticks are dark brown in color. Nymphs of the black-legged tick are approximately 1.0 mm in length and will also feed on humans or other mammals and birds. The primary host of adult black-legged ticks is the white-tailed deer although they will feed on a variety of mammals and birds. Black-legged or deer ticks transmit the agents of Lyme disease, Anaplasmosis, and Babesiosis.
The female Lone Star tick has a characteristic white or yellow mark on the end of the scutum, from which the common name is derived. Both males and females are reddish brown in color and about 3.0 to 4.0 mm long. Tularemia and Ehrlichiosis are transmitted by this species. It has also been linked with a Lyme Disease-like illness called southern tick-associated rash illness (STARI) which may be caused by the spirochete Borrelia lonestari. The Lone Star tick does not transmit the Lyme Disease spirochete Borrelia burgdorferi. Lone Star ticks have a non-specific host preference and will seek blood meals from virtually any mammal. This is the most commonly found tick in Fairfax County.
Adult American dog ticks are reddish brown in color and about 5.0mm in length. They can be distinguished from deer ticks on the basis of white markings on the perimeter of the dorsal scutum.Dogs (as the common name suggests) are the preferred hosts of adult American dog ticks but they will feed on other medium to large mammals including humans. The immature stages feed on small mammals, including meadow voles and white-footed mice. The American dog tick transmits Rocky Mountain spotted fever and Tularemia in the Eastern region of the United States.
NOTE: Ticks are not to scale.
The video attached to this link will help you keep ticks away. http://extension.unh.edu/Intehgrated-Pest-Management/Public-Health-IPM