Identification of the adults, nymphs and larvae of ticks of the genus Dermacentor Koch (Ixodidae) in the western United States

Abstract

In 1910 C. W. Stiles made the following comment as a part of a summary statement to his extensive study of the stigmatal plates of Dermaeentor ticks: "The specific determination of ticks is attended in many cases with con-siderable difficulty."