About Dermacentor albipictus Packard, 1869
Dermacentor albipictus Packard, 1869, commonly called the winter tick, is sexually dimorphic: adult females are larger than adult males. Adult females are mostly reddish-brown, and have a white dorsal shield located behind the head. The smaller adult males are dark brown with scattered white markings. Toward the end of winter, fully developed female winter ticks grow to an unusually large size, reaching up to 15 mm (0.6 in) in length.